[llvm] [AMDGPU] Eliminate redundant s_round_mode writes (PR #216305)

[Shilei Tian via llvm-commits]

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@@ -792,6 +861,10 @@ bool SIPreEmitPeephole::run(MachineFunction &MF, MachineLoopInfo *LoopInfo) {
 
   MF.RenumberBlocks();
 
+  for (MachineBasicBlock &MBB : MF) {
+    Changed |= removeRedundantRoundMode(MBB);
+  }
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shiltian wrote:

Can we merge it to the for loop below?

https://github.com/llvm/llvm-project/pull/216305