I missed this during review. We cannot declare a `tests` module within
`shared_helpers.rs` itself, as shim binaries that tries to include the
`shared_helpers` module through `#[path = ".."]` attributes would fail
to find it, breaking `./x check bootstrap`.

This reverts commit `40c2ca96411caaeab1563ff9041879f742d1d71b`.

This check is relatively cheap, and is a quick way to root out breaking
check flow of `bootstrap` itself.

…ts, r=Kobzol

Fix `./x check bootstrap` (again)

Redoes rust-lang#134883 and reverts 40c2ca9 from rust-lang#142416. Unfortunately I missed this during review.

- Commit 1: Reverts 40c2ca9 and re-applies rust-lang#134883.
- Commit 2: Check `./x check bootstrap` in `pr-check-1` to catch "obvious" problems like this.

r? Kobzol

Rollup of 13 pull requests

Successful merges:

 - #144356 (Add `ignore-backends` annotations in failing GCC backend ui tests)
 - #144359 (add codegen test for variadics)
 - #144376 (Suggest unwrapping when private method name is available in inner type)
 - #144379 (test using multiple c-variadic ABIs in the same program)
 - #144383 (disable cfg.has_reliable_f128 on amdgcn)
 - #144409 (Stop compilation early if macro expansion failed)
 - #144412 (Small cleanup: Use LocalKey<Cell> methods more)
 - #144421 (Call `is_parsed_attribute` rather than keeping track of a list of parsed attributes manually)
 - #144422 (library/windows_targets: Fix macro expansion error in 'link' macro)
 - #144424 (Allow setting `release-blog-post` label with rustbot)
 - #144430 (tests: aarch64-outline-atomics: Remove hardcoded target)
 - #144435 (rustc-dev-guide subtree update)
 - #144445 (Fix `./x check bootstrap` (again))

r? `@ghost`
`@rustbot` modify labels: rollup

Rollup of 13 pull requests

Successful merges:

 - #144356 (Add `ignore-backends` annotations in failing GCC backend ui tests)
 - #144359 (add codegen test for variadics)
 - #144376 (Suggest unwrapping when private method name is available in inner type)
 - #144379 (test using multiple c-variadic ABIs in the same program)
 - #144383 (disable cfg.has_reliable_f128 on amdgcn)
 - #144409 (Stop compilation early if macro expansion failed)
 - #144412 (Small cleanup: Use LocalKey<Cell> methods more)
 - #144421 (Call `is_parsed_attribute` rather than keeping track of a list of parsed attributes manually)
 - #144422 (library/windows_targets: Fix macro expansion error in 'link' macro)
 - #144424 (Allow setting `release-blog-post` label with rustbot)
 - #144430 (tests: aarch64-outline-atomics: Remove hardcoded target)
 - #144435 (rustc-dev-guide subtree update)
 - #144445 (Fix `./x check bootstrap` (again))

r? `@ghost`
`@rustbot` modify labels: rollup

Rollup of 13 pull requests

Successful merges:

 - #144356 (Add `ignore-backends` annotations in failing GCC backend ui tests)
 - #144359 (add codegen test for variadics)
 - #144376 (Suggest unwrapping when private method name is available in inner type)
 - #144379 (test using multiple c-variadic ABIs in the same program)
 - #144383 (disable cfg.has_reliable_f128 on amdgcn)
 - #144409 (Stop compilation early if macro expansion failed)
 - #144412 (Small cleanup: Use LocalKey<Cell> methods more)
 - #144421 (Call `is_parsed_attribute` rather than keeping track of a list of parsed attributes manually)
 - #144422 (library/windows_targets: Fix macro expansion error in 'link' macro)
 - #144424 (Allow setting `release-blog-post` label with rustbot)
 - #144430 (tests: aarch64-outline-atomics: Remove hardcoded target)
 - #144435 (rustc-dev-guide subtree update)
 - #144445 (Fix `./x check bootstrap` (again))

r? `@ghost`
`@rustbot` modify labels: rollup

…ts, r=Kobzol

Fix `./x check bootstrap` (again)

Redoes rust-lang#134883 and reverts 40c2ca9 from rust-lang#142416. Unfortunately I missed this during review.

- Commit 1: Reverts 40c2ca9 and re-applies rust-lang#134883.
- Commit 2: Check `./x check bootstrap` in `pr-check-1` to catch "obvious" problems like this.

r? Kobzol

Rollup of 14 pull requests

Successful merges:

 - #144316 (bootstrap: Move musl-root fallback out of sanity check)
 - #144352 (RustWrapper: Suppress getNextNonDebugInfoInstruction)
 - #144356 (Add `ignore-backends` annotations in failing GCC backend ui tests)
 - #144359 (add codegen test for variadics)
 - #144376 (Suggest unwrapping when private method name is available in inner type)
 - #144379 (test using multiple c-variadic ABIs in the same program)
 - #144383 (disable cfg.has_reliable_f128 on amdgcn)
 - #144412 (Small cleanup: Use LocalKey<Cell> methods more)
 - #144421 (Call `is_parsed_attribute` rather than keeping track of a list of parsed attributes manually)
 - #144422 (library/windows_targets: Fix macro expansion error in 'link' macro)
 - #144424 (Allow setting `release-blog-post` label with rustbot)
 - #144430 (tests: aarch64-outline-atomics: Remove hardcoded target)
 - #144435 (rustc-dev-guide subtree update)
 - #144445 (Fix `./x check bootstrap` (again))

r? `@ghost`
`@rustbot` modify labels: rollup

…ts, r=Kobzol

Fix `./x check bootstrap` (again)

Redoes rust-lang#134883 and reverts 40c2ca9 from rust-lang#142416. Unfortunately I missed this during review.

- Commit 1: Reverts 40c2ca9 and re-applies rust-lang#134883.
- Commit 2: Check `./x check bootstrap` in `pr-check-1` to catch "obvious" problems like this.

r? Kobzol

Rollup of 10 pull requests

Successful merges:

 - #144359 (add codegen test for variadics)
 - #144409 (Stop compilation early if macro expansion failed)
 - #144422 (library/windows_targets: Fix macro expansion error in 'link' macro)
 - #144430 (tests: aarch64-outline-atomics: Remove hardcoded target)
 - #144445 (Fix `./x check bootstrap` (again))
 - #144453 (canonicalize build root in `tests/run-make/linker-warning`)
 - #144454 (move uefi test to run-make)
 - #144464 (Only run bootstrap tests in `x test` on CI)
 - #144495 (bump cargo_metadata)
 - #144500 (thread name in stack overflow message)

r? `@ghost`
`@rustbot` modify labels: rollup

…ts, r=Kobzol

Fix `./x check bootstrap` (again)

Redoes rust-lang#134883 and reverts 40c2ca9 from rust-lang#142416. Unfortunately I missed this during review.

- Commit 1: Reverts 40c2ca9 and re-applies rust-lang#134883.
- Commit 2: Check `./x check bootstrap` in `pr-check-1` to catch "obvious" problems like this.

r? Kobzol

Rollup of 9 pull requests

Successful merges:

 - #144359 (add codegen test for variadics)
 - #144409 (Stop compilation early if macro expansion failed)
 - #144422 (library/windows_targets: Fix macro expansion error in 'link' macro)
 - #144430 (tests: aarch64-outline-atomics: Remove hardcoded target)
 - #144445 (Fix `./x check bootstrap` (again))
 - #144453 (canonicalize build root in `tests/run-make/linker-warning`)
 - #144454 (move uefi test to run-make)
 - #144464 (Only run bootstrap tests in `x test` on CI)
 - #144495 (bump cargo_metadata)

r? `@ghost`
`@rustbot` modify labels: rollup

…ts, r=Kobzol

Fix `./x check bootstrap` (again)

Redoes rust-lang#134883 and reverts 40c2ca9 from rust-lang#142416. Unfortunately I missed this during review.

- Commit 1: Reverts 40c2ca9 and re-applies rust-lang#134883.
- Commit 2: Check `./x check bootstrap` in `pr-check-1` to catch "obvious" problems like this.

r? Kobzol

Rollup of 13 pull requests

Successful merges:

 - #144359 (add codegen test for variadics)
 - #144379 (test using multiple c-variadic ABIs in the same program)
 - #144383 (disable cfg.has_reliable_f128 on amdgcn)
 - #144409 (Stop compilation early if macro expansion failed)
 - #144422 (library/windows_targets: Fix macro expansion error in 'link' macro)
 - #144429 (Enable outline-atomics for aarch64-unknown-linux-musl)
 - #144430 (tests: aarch64-outline-atomics: Remove hardcoded target)
 - #144445 (Fix `./x check bootstrap` (again))
 - #144453 (canonicalize build root in `tests/run-make/linker-warning`)
 - #144464 (Only run bootstrap tests in `x test` on CI)
 - #144470 (clif: Don't set the `compiler-builtins-no-f16-f128` feature)
 - #144480 (Revert "coverage: Enlarge empty spans during MIR instrumentation, not codegen")
 - #144495 (bump cargo_metadata)

r? `@ghost`
`@rustbot` modify labels: rollup

Rollup of 13 pull requests

Successful merges:

 - #141840 (If `HOME` is empty, use the fallback instead)
 - #144359 (add codegen test for variadics)
 - #144379 (test using multiple c-variadic ABIs in the same program)
 - #144383 (disable cfg.has_reliable_f128 on amdgcn)
 - #144409 (Stop compilation early if macro expansion failed)
 - #144422 (library/windows_targets: Fix macro expansion error in 'link' macro)
 - #144429 (Enable outline-atomics for aarch64-unknown-linux-musl)
 - #144430 (tests: aarch64-outline-atomics: Remove hardcoded target)
 - #144445 (Fix `./x check bootstrap` (again))
 - #144453 (canonicalize build root in `tests/run-make/linker-warning`)
 - #144464 (Only run bootstrap tests in `x test` on CI)
 - #144470 (clif: Don't set the `compiler-builtins-no-f16-f128` feature)
 - #144480 (Revert "coverage: Enlarge empty spans during MIR instrumentation, not codegen")

r? `@ghost`
`@rustbot` modify labels: rollup

Rollup merge of #144445 - jieyouxu:revert-shared_helpers_tests, r=Kobzol

Fix `./x check bootstrap` (again)

Redoes #134883 and reverts 40c2ca9 from #142416. Unfortunately I missed this during review.

- Commit 1: Reverts 40c2ca9 and re-applies #134883.
- Commit 2: Check `./x check bootstrap` in `pr-check-1` to catch "obvious" problems like this.

r? Kobzol