[clang] [Clang] Fix failing CI with different test case attribute & test macro (PR #76863)

[Erich Keane via cfe-commits]

erichkeane wrote:

Is `preserve_most` enabled for all platforms?  It looks like it'll eventually go to the `TargetInfo::checkCallingConvention` for each target, and I'm pretty sure we don't support it for all targets.

You're likely better off just adding a triple/handful of triples here.

https://github.com/llvm/llvm-project/pull/76863