[llvm] [AMDGPU] Skip debug machine instructions in AMDGPU SIWholeQuadMode pass. (PR #134518)

[Matt Arsenault via llvm-commits]

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@@ -1300,6 +1300,12 @@ void SIWholeQuadMode::processBlock(MachineBasicBlock &MBB, BlockInfo &BI,
 
   for (unsigned Idx = 0;; ++Idx) {
     MachineBasicBlock::iterator Next = II;
+
+    if (II != IE && II->isDebugInstr()) {
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arsenm wrote:

Why not all meta instructions? Also testcase? 

https://github.com/llvm/llvm-project/pull/134518