[llvm] [AMDGPU][NFC][SIInsertWaitcnts] Remove redundant checks for invalidate instructions (PR #166139)

[Jay Foad via llvm-commits]

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@@ -530,16 +544,6 @@ class SIInsertWaitcnts {
   // Return the appropriate VMEM_*_ACCESS type for Inst, which must be a VMEM
   // instruction.
   WaitEventType getVmemWaitEventType(const MachineInstr &Inst) const {
-    switch (Inst.getOpcode()) {
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jayfoad wrote:

Is there some reason why this function _should not_ handle these instructions? The only documented precondition is that Inst should be a VMEM instruction, which these are.

https://github.com/llvm/llvm-project/pull/166139