Files
rust/tests/codegen
bors 0fe8f3454d Auto merge of #137412 - scottmcm:redo-swap, r=cuviper
Ensure `swap_nonoverlapping` is really always untyped

This replaces #134954, which was arguably overcomplicated.

## Fixes #134713

Actually using the type passed to `ptr::swap_nonoverlapping` for anything other than its size + align turns out to not work, so this goes back to always erasing the types down to just bytes.

(Except in `const`, which keeps doing the same thing as before to preserve `@RalfJung's` fix from #134689)

## Fixes #134946

I'd previously moved the swapping to use auto-vectorization *on bytes*, but someone pointed out on Discord that the tail loop handling from that left a whole bunch of byte-by-byte swapping around.  This goes back to manual tail handling to avoid that, then still triggers auto-vectorization on pointer-width values.  (So you'll see `<4 x i64>` on `x86-64-v3` for example.)
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The files here use the LLVM FileCheck framework, documented at https://llvm.org/docs/CommandGuide/FileCheck.html.

One extension worth noting is the use of revisions as custom prefixes for FileCheck. If your codegen test has different behavior based on the chosen target or different compiler flags that you want to exercise, you can use a revisions annotation, like so:

// revisions: aaa bbb
// [bbb] compile-flags: --flags-for-bbb

After specifying those variations, you can write different expected, or explicitly unexpected output by using <prefix>-SAME: and <prefix>-NOT:, like so:

// CHECK: expected code
// aaa-SAME: emitted-only-for-aaa
// aaa-NOT:                        emitted-only-for-bbb
// bbb-NOT:  emitted-only-for-aaa
// bbb-SAME:                       emitted-only-for-bbb