Dylan DPC 391cbdaa7c
Rollup merge of #115096 - kadiwa4:no_memcpy_padding, r=cjgillot
Add regression test for not `memcpy`ing padding bytes

Closes #56297

See this comparison: https://rust.godbolt.org/z/jjzfonfcE

I don't have any experience with codegen tests, I hope this is correct
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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