These shims are only needed on 32-bit x86. Additionally since https://reviews.llvm.org/rL268875 LLVM handles adding the shims itself for the intrinsics.

* Use `black_box` to avoid memory leak removal during optimization.
* Leak multiple objects to make test case more robust.

The condition
if obligation.recursion_depth >= 0
is always true since recursion_depth is usize.

The else branch is dead code and can be removed.

Found by Clippy.

Fixes rust-lang#68251

Don't use f64 shims for f32 cmath functions on non 32-bit x86 MSVC

These shims are only needed on 32-bit x86. Additionally since https://reviews.llvm.org/rL268875 LLVM handles adding the shims itself for the intrinsics.

Enable leak sanitizer test case

* Use `black_box` to avoid memory leak removal during optimization.
* Leak multiple objects to make test case more robust.

Remove unused auxiliary file that was replaced with rust_test_helpers

…light_escape, r=GuillaumeGomez

rustdoc: HTML escape codeblocks which fail syntax highlighting

r? @GuillaumeGomez

remove dead code

The condition
`if obligation.recursion_depth >= 0`
is always true since `recursion_depth` is `usize`.

The else branch is dead code and can be removed.

Found by Clippy.

Fixes rust-lang#68251