[llvm] [AMDGPU] Prevent genration of unused SGPR IMPLICIT_DEF assignments (PR #155241)

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``````````bash
git-clang-format --diff HEAD~1 HEAD --extensions cpp -- llvm/lib/Target/AMDGPU/SIFixSGPRCopies.cpp llvm/lib/Target/AMDGPU/SIInstrInfo.cpp
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View the diff from clang-format here.
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``````````diff
diff --git a/llvm/lib/Target/AMDGPU/SIFixSGPRCopies.cpp b/llvm/lib/Target/AMDGPU/SIFixSGPRCopies.cpp
index cb60f13b2..dce4e6f99 100644
--- a/llvm/lib/Target/AMDGPU/SIFixSGPRCopies.cpp
+++ b/llvm/lib/Target/AMDGPU/SIFixSGPRCopies.cpp
@@ -1072,7 +1072,7 @@ void SIFixSGPRCopies::lowerVGPR2SGPRCopies(MachineFunction &MF) {
 
   TII->moveToVALU(Copies, MDT);
   Copies.clear();
-  
+
   // Now do actual lowering
   for (auto C : V2SCopies) {
     MachineInstr *MI = C.second.Copy;
diff --git a/llvm/lib/Target/AMDGPU/SIInstrInfo.cpp b/llvm/lib/Target/AMDGPU/SIInstrInfo.cpp
index 8d3f709e8..38a1dad10 100644
--- a/llvm/lib/Target/AMDGPU/SIInstrInfo.cpp
+++ b/llvm/lib/Target/AMDGPU/SIInstrInfo.cpp
@@ -8063,8 +8063,8 @@ void SIInstrInfo::moveToVALUImpl(SIInstrWorklist &Worklist,
       MRI.replaceRegWith(DstReg, NewDstReg);
       MRI.clearKillFlags(NewDstReg);
       Inst.getOperand(0).setReg(DstReg);
-      // Completely remove dead VGPR->SGPR copies and ensure that dead assignments
-      // to IMPLICIT_DEF are not created.
+      // Completely remove dead VGPR->SGPR copies and ensure that dead
+      // assignments to IMPLICIT_DEF are not created.
       Inst.eraseFromParent();
       // Legalize t16 operand since replaceReg is called after addUsersToVALU
       for (MachineOperand &MO :

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https://github.com/llvm/llvm-project/pull/155241