[llvm] [WIP][AMDGPU][SIInsertWaitcnts] Do not add s_waitcnt when the counters are known to be 0 already (PR #65735)

[Jay Foad via llvm-commits]

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@@ -477,7 +483,7 @@ class SIInsertWaitcnts : public MachineFunctionPass {
   bool generateWaitcnt(AMDGPU::Waitcnt Wait,
                        MachineBasicBlock::instr_iterator It,
                        MachineBasicBlock &Block, WaitcntBrackets &ScoreBrackets,
-                       MachineInstr *OldWaitcntInstr);
+                       MachineInstr *OldWaitcntInstr) const;
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jayfoad wrote:

Looks like an unrelated clean up? Please commit it separately.

https://github.com/llvm/llvm-project/pull/65735