Files
rust/tests/codegen-llvm
bors 2219766af6 Auto merge of #152605 - scottmcm:box-drop-alignment, r=Mark-Simulacrum
Pass alignments through the shim as `Alignment` (not `usize`)

We're using `Layout` on both sides, so might as well skip the transmutes back and forth to `usize`.

The mir-opt test shows that doing so allows simplifying the boxed-slice drop slightly, for example.
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..
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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