[llvm] [AMDGPU] Insert readfirstlane for uniform VGPR arguments (PR #178198)

[Harald van Dijk via llvm-commits]

hvdijk wrote:

"or report" sounds like a far too strong policy. Not reverting is fine but if a change specifically touches M68k files, and breaks M68k, suggesting that it's not even permitted to mention that it got broken seems silly.

> Hi @hvdijk I'm looking into it. shall I create a PR or just push the change to main??

In my opinion this would count as a sufficiently obvious fix that the current policy of "You are allowed to commit patches without approval which you think are obvious" would still apply, but do note arsenm's comment too.

https://github.com/llvm/llvm-project/pull/178198