[llvm] [SystemZ] Replace SELRMux with COPY in case of identical operands. (PR #125108)

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``````````bash
git-clang-format --diff 08c76730f35e1dd3c9330b47fc304a35e6d9087e 4dfdc2cd054fb569bd423eda3e480f2df95dda65 --extensions cpp -- llvm/lib/Target/SystemZ/SystemZPostRewrite.cpp
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View the diff from clang-format here.
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``````````diff
diff --git a/llvm/lib/Target/SystemZ/SystemZPostRewrite.cpp b/llvm/lib/Target/SystemZ/SystemZPostRewrite.cpp
index 6b6ec5b6b9..cf3073f0f2 100644
--- a/llvm/lib/Target/SystemZ/SystemZPostRewrite.cpp
+++ b/llvm/lib/Target/SystemZ/SystemZPostRewrite.cpp
@@ -114,7 +114,7 @@ void SystemZPostRewrite::selectSELRMux(MachineBasicBlock &MBB,
   if (Src1Reg == Src2Reg) {
     BuildMI(*MBBI->getParent(), MBBI, MBBI->getDebugLoc(),
             TII->get(SystemZ::COPY), DestReg)
-      .addReg(MBBI->getOperand(1).getReg(), getRegState(MBBI->getOperand(1)));
+        .addReg(MBBI->getOperand(1).getReg(), getRegState(MBBI->getOperand(1)));
     MBBI->eraseFromParent();
     return;
   }

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https://github.com/llvm/llvm-project/pull/125108