…or-tests, r=saethlin

tests: `-Copt-level=3` instead of `-O` in assembly tests

An effective blocker for redefining the meaning of `-O` is to stop reusing this somewhat ambiguous alias in our own assembly test suite. The choice between `-Copt-level=2` and `-Copt-level=3` is arbitrary for most of our tests. In most cases it makes no difference, so I set most of them to `-Copt-level=3`, as it will lead to slightly more "normalized" assembly.

Rollup of 6 pull requests

Successful merges:

 - rust-lang#134999 (Add cygwin target.)
 - rust-lang#135677 (Small `rustc_resolve` cleanups)
 - rust-lang#136699 (std: replace the `FromInner` implementation for addresses with private conversion functions)
 - rust-lang#136758 (tests: `-Copt-level=3` instead of `-O` in assembly tests)
 - rust-lang#136761 (tests: `-Copt-level=3` instead of `-O` in codegen tests)
 - rust-lang#136833 (compiler: die immediately instead of handling unknown target codegen)

Failed merges:

 - rust-lang#136808 (Try to recover from path sep error in type parsing)

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

Rollup of 7 pull requests

Successful merges:

 - rust-lang#134090 (Stabilize target_feature_11)
 - rust-lang#134999 (Add cygwin target.)
 - rust-lang#135025 (Cast allocas to default address space)
 - rust-lang#135408 (x86: make SSE2 required for i686 hardfloat targets and use it to pass SIMD types)
 - rust-lang#135549 (Document some safety constraints and use more safe wrappers)
 - rust-lang#136193 (Implement pattern type ffi checks)
 - rust-lang#136699 (std: replace the `FromInner` implementation for addresses with private conversion functions)

Failed merges:

 - rust-lang#136758 (tests: `-Copt-level=3` instead of `-O` in assembly tests)

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

…or-tests, r=saethlin

tests: `-Copt-level=3` instead of `-O` in assembly tests

An effective blocker for redefining the meaning of `-O` is to stop reusing this somewhat ambiguous alias in our own assembly test suite. The choice between `-Copt-level=2` and `-Copt-level=3` is arbitrary for most of our tests. In most cases it makes no difference, so I set most of them to `-Copt-level=3`, as it will lead to slightly more "normalized" assembly.

…llaumeGomez

Rollup of 9 pull requests

Successful merges:

 - rust-lang#135025 (Cast allocas to default address space)
 - rust-lang#136217 (Mark condition/carry bit as clobbered in C-SKY inline assembly)
 - rust-lang#136699 (std: replace the `FromInner` implementation for addresses with private conversion functions)
 - rust-lang#136758 (tests: `-Copt-level=3` instead of `-O` in assembly tests)
 - rust-lang#136761 (tests: `-Copt-level=3` instead of `-O` in codegen tests)
 - rust-lang#136807 (compiler: internally merge `PtxKernel` into `GpuKernel`)
 - rust-lang#136818 (Implement `read*_exact` for `std:io::repeat`)
 - rust-lang#136831 (Update stdarch)
 - rust-lang#136916 (use cc archiver as default in `cc2ar`)

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

…llaumeGomez

Rollup of 10 pull requests

Successful merges:

 - rust-lang#136758 (tests: `-Copt-level=3` instead of `-O` in assembly tests)
 - rust-lang#136761 (tests: `-Copt-level=3` instead of `-O` in codegen tests)
 - rust-lang#136784 (Nuke `Buffer` abstraction from `librustdoc`, take 2 💣)
 - rust-lang#136838 (Check whole `Unsize` predicate for escaping bound vars)
 - rust-lang#136848 (add docs and ut for bootstrap util cache)
 - rust-lang#136871 (dev-guide: Link to `t-lang` procedures for new features)
 - rust-lang#136890 (Change swap_nonoverlapping from lang to library UB)
 - rust-lang#136901 (compiler: give `ExternAbi` truly stable `Hash` and `Ord`)
 - rust-lang#136907 (compiler: Make middle errors `pub(crate)` and bury the dead code)
 - rust-lang#136916 (use cc archiver as default in `cc2ar`)

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

Rollup merge of rust-lang#136758 - workingjubilee:specify-opt-level-for-tests, r=saethlin

tests: `-Copt-level=3` instead of `-O` in assembly tests

An effective blocker for redefining the meaning of `-O` is to stop reusing this somewhat ambiguous alias in our own assembly test suite. The choice between `-Copt-level=2` and `-Copt-level=3` is arbitrary for most of our tests. In most cases it makes no difference, so I set most of them to `-Copt-level=3`, as it will lead to slightly more "normalized" assembly.