[llvm] [AMDGPU][SIInsertWaitCnts] Use RegUnits-based tracking (PR #162077)

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``````````bash
git-clang-format --diff origin/main HEAD --extensions cpp -- llvm/lib/Target/AMDGPU/SIInsertWaitcnts.cpp
``````````

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``````````diff
diff --git a/llvm/lib/Target/AMDGPU/SIInsertWaitcnts.cpp b/llvm/lib/Target/AMDGPU/SIInsertWaitcnts.cpp
index dfcccf8cb..874101dac 100644
--- a/llvm/lib/Target/AMDGPU/SIInsertWaitcnts.cpp
+++ b/llvm/lib/Target/AMDGPU/SIInsertWaitcnts.cpp
@@ -1095,12 +1095,11 @@ void WaitcntBrackets::print(raw_ostream &OS) const {
       break;
     }
 
-
     if (SR != 0) {
       // Print vgpr scores.
       unsigned LB = getScoreLB(T);
 
-      for (auto &[ID, Info]: VMem) {
+      for (auto &[ID, Info] : VMem) {
         unsigned RegScore = Info.Scores[T];
         if (RegScore <= LB)
           continue;
@@ -1114,10 +1113,10 @@ void WaitcntBrackets::print(raw_ostream &OS) const {
 
       // Also need to print sgpr scores for lgkm_cnt or xcnt.
       if (isSmemCounter(T)) {
-        for (auto &[ID, Info]: SGPRs) {
+        for (auto &[ID, Info] : SGPRs) {
           unsigned RegScore = Info.Scores[getSgprScoresIdx(T)];
           if (RegScore <= LB)
-          continue;
+            continue;
           unsigned RelScore = RegScore - LB - 1;
           OS << RelScore << ":sRU" << ID << " ";
         }

``````````

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https://github.com/llvm/llvm-project/pull/162077