…ts/deps/slab-0.4.11

Bump slab from 0.4.10 to 0.4.11 in /tests/deps

CI: also test build on powerpc

add some ZST reborrow tests

…-rdtsc

Account for time spent tracing, use RDTSC for faster time

tree borrows: refactor new-permission logic

Rollup of 16 pull requests

Successful merges:

 - #143725 (core: add Peekable::next_if_map)
 - #145209 (Stabilize `path_add_extension`)
 - #145342 (fix drop scope for `super let` bindings within `if let`)
 - #145750 (raw_vec.rs: Remove superfluous fn alloc_guard)
 - #145962 (Ensure we emit an allocator shim when only some crate types need one)
 - #145963 (Add LSX accelerated implementation for source file analysis)
 - #146054 (add `#[must_use]` to `array::repeat`)
 - #146090 (Derive `PartialEq` for `InvisibleOrigin`)
 - #146120 (Correct typo in `rustc_errors` comment)
 - #146127 (Rename `ToolRustc` to `ToolRustcPrivate`)
 - #146133 (Revert "Make `lto` and `linker-plugin-lto` work the same for `compiler_builtins`)
 - #146134 (llvm: nvptx: Layout update to match LLVM)
 - #146136 (docs(std): add missing closing code block fences in doc comments)
 - #146137 (Disallow frontmatter in `--cfg` and `--check-cfg` arguments)
 - #146140 (compiletest: cygwin follows windows in using PATH for dynamic libraries)
 - #146156 (miri subtree update)

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