[llvm] [AMDGPU] Move renamedInGFX9 from TableGen to SIInstrInfo helper function/macro to free up a bit slot (PR #82787)

[Matt Arsenault via llvm-commits]

https://github.com/arsenm approved this pull request.

There was something I wanted to check for this, but I don't remember what it was.

pseudoToMCOpcode now requires much more manual effort than should really be required. I continue to move towards thinking using all of these pseudo instructions is a mistake, and we should move towards using real instructions with subtarget specific restrictions from the beginning like every other target does 



https://github.com/llvm/llvm-project/pull/82787