[llvm] [AMDGPU] Handle AV classes in SIFixSGPRCopies::processPHINode (PR #169038)

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

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``````````diff
diff --git a/llvm/lib/Target/AMDGPU/SIFixSGPRCopies.cpp b/llvm/lib/Target/AMDGPU/SIFixSGPRCopies.cpp
index 3e4b25dd2..39a6a7762 100644
--- a/llvm/lib/Target/AMDGPU/SIFixSGPRCopies.cpp
+++ b/llvm/lib/Target/AMDGPU/SIFixSGPRCopies.cpp
@@ -857,7 +857,7 @@ void SIFixSGPRCopies::processPHINode(MachineInstr &MI) {
   }
 
   if (TRI->hasVectorRegisters(MRI->getRegClass(PHIRes)) ||
-       RC0 == &AMDGPU::VReg_1RegClass) {
+      RC0 == &AMDGPU::VReg_1RegClass) {
     LLVM_DEBUG(dbgs() << "Legalizing PHI: " << MI);
     TII->legalizeOperands(MI, MDT);
   }

``````````

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https://github.com/llvm/llvm-project/pull/169038