[llvm] [clang] [clang-tools-extra] [AMDGPU] Fix GCNRewritePartialRegUses pass: vector regclass is selected instead of scalar. (PR #69957)

[Carl Ritson via cfe-commits]

perlfu wrote:

> I can regenerate the tests but I'm not sure how to do it best here: submit the updated tests, rebase this PR's branch on top of the commit and then force push the branch? Or I can simply merge _main_ with the updated tests commit into this PR's branch?

I do not know what is expected/common practice, I suspect either approach is valid.
I have certainly seen people merge _main_ before, but typically I opt for a rebase and force push.

https://github.com/llvm/llvm-project/pull/69957