[llvm] [AMDGPU][SIInsertWaitcnts][NFC] Move instruction collection into a separate function (PR #179358)

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

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``````````diff
diff --git a/llvm/lib/Target/AMDGPU/SIInsertWaitcnts.cpp b/llvm/lib/Target/AMDGPU/SIInsertWaitcnts.cpp
index 1625616e0..430d2c467 100644
--- a/llvm/lib/Target/AMDGPU/SIInsertWaitcnts.cpp
+++ b/llvm/lib/Target/AMDGPU/SIInsertWaitcnts.cpp
@@ -2405,7 +2405,7 @@ void SIInsertWaitcnts::updateStateBeforeWaitcnt(
     EndPgmInsts[&MI] = !ScoreBrackets.empty(STORE_CNT) &&
                        !ScoreBrackets.hasPendingEvent(SCRATCH_WRITE_ACCESS);
     break;
-   default:
+  default:
     if (MI.isCall())
       CallInsts.insert(&MI);
     break;

``````````

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https://github.com/llvm/llvm-project/pull/179358