[llvm] [AMDGPU] Reset kill flags for multiple uses of SDWAInst Ops (PR #97135)

[Matt Arsenault via llvm-commits]

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+; NOTE: Assertions have been autogenerated by utils/update_mir_test_checks.py UTC_ARGS: --version 5
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arsenm wrote:

Better to just check the final ISA? It would be better to have a supplemental MIR test that has an explicit kill flag, a lot of things could have lost the flag before this point 

https://github.com/llvm/llvm-project/pull/97135