Files
rust/tests/codegen-llvm
Zalathar 028b8b6c54 Simplify //@ needs-asm-mnemonic: ret to just //@ needs-asm-ret
The `needs-asm-mnemonic` directive was very general, but in practice was only
being used for `ret`. There are very few other mnemonics that it could
plausibly be useful for (e.g. `nop`), because any instruction that requires
arguments is probably going to be non-portable.

This PR replaces `needs-asm-mnemonic` with a simpler `needs-asm-ret` directive
that uses the same machinery as other simple needs directives.

If we happend to need more mnemonics in the future, we can just add more simple
directives as appropriate (e.g. `needs-asm-nop`).
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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