Hint that memchr returns an in-bounds index - #159784

…result-bounds, r=Darksonn

Hint that memchr returns an in-bounds index

`memchr_aligned` always returns an index within the input slice, but that fact was not visible to callers after inlining. Record the invariant with `assert_unchecked` so LLVM can simplify callers such as `str::find(char)`

 In x86_64 codegen, `find(char)` shrank from 463 to 377 bytes.

…result-bounds, r=Darksonn

Hint that memchr returns an in-bounds index

`memchr_aligned` always returns an index within the input slice, but that fact was not visible to callers after inlining. Record the invariant with `assert_unchecked` so LLVM can simplify callers such as `str::find(char)`

 In x86_64 codegen, `find(char)` shrank from 463 to 377 bytes.

…uwer

Rollup of 22 pull requests

Successful merges:

 - #158147 (std: fix stack buffer overflow in Windows junction_point)
 - #159784 (Hint that memchr returns an in-bounds index)
 - #160130 (Select cache values to verify by key fingerprint, not value fingerprint)
 - #160343 (Rename `OutlivesPredicate` to `OutlivesClause`)
 - #160360 (Remove rustc_middle dependency on rustc_hir_pretty)
 - #160387 (rustc_codegen_ssa: Correctly apply the static `--jobs-backend` limit to backend parallelism)
 - #160422 (move mir-opt miri tests to CI logic)
 - #160444 (Avoid resolving path keywords outside `TypeNS`)
 - #160510 (Resolver: (un)tracked borrows for `CmRefCell` made safe my unsafe speculative flag)
 - #155424 ([blocked] Link to proposed LLM policy in CONTRIBUTING and pull request template)
 - #158726 (std: move futex implementations into sys::sync::futex)
 - #159225 (Split IncrCompSession out of Session)
 - #159820 (Make the `rustc_unsafe_specialization_marker` attribute actually `unsafe`)
 - #160198 (Rework `smallest_range_containing` to handle duplicates)
 - #160362 (Split `SpannedTypeVisitor` into its own crate, `rustc_ty_walk`)
 - #160390 (autodiff: Handle slice-tailed DSTs in type trees)
 - #160420 (Suggest `cast_signed()` for overflowing signed integer literals)
 - #160520 (Add some tests for specialization)
 - #160522 (fix(bootstrap): Normalize the names of proc macro dependency crates)
 - #160531 (docs: fix typo in AllowExprMetavar comment)
 - #160538 (Update expect messages in tcp.rs doc examples to follow the style guide)
 - #160548 (bootstrap: Register `coverage-map` and `coverage-run` aliases via a separate step)

…ds, r=<try>

Hint that memchr returns an in-bounds index


try-job: x86_64-gnu-llvm-21-3

…result-bounds, r=Darksonn

Hint that memchr returns an in-bounds index

`memchr_aligned` always returns an index within the input slice, but that fact was not visible to callers after inlining. Record the invariant with `assert_unchecked` so LLVM can simplify callers such as `str::find(char)`

 In x86_64 codegen, `find(char)` shrank from 463 to 377 bytes.