[llvm] [AMDGPU][SIInsertWaitcnts][NFC] Move static array definition (PR #178014)

[Jay Foad via llvm-commits]

https://github.com/jayfoad commented:

No specific objection to this patch, but please give some motivation. Why is moving the array better? If it enables some more cleanup, then either say so or open a stack of PRs so we can see the whole context. Also if the title is just "Move static array definition" then please don't include unrelated changes.

https://github.com/llvm/llvm-project/pull/178014