[llvm] [TwoAddressInstruction] Propagate undef flags for partial defs (PR #79286)

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<!--LLVM CODE FORMAT COMMENT: {clang-format}-->


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``````````bash
git-clang-format --diff d1b473c7956c080fe4d784bb89f720fbd28024a6 19bba42a9cc4e0f473d95795a40a9333d179950a -- llvm/lib/CodeGen/TwoAddressInstructionPass.cpp
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View the diff from clang-format here.
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``````````diff
diff --git a/llvm/lib/CodeGen/TwoAddressInstructionPass.cpp b/llvm/lib/CodeGen/TwoAddressInstructionPass.cpp
index 0b8bef24d1..af042c972a 100644
--- a/llvm/lib/CodeGen/TwoAddressInstructionPass.cpp
+++ b/llvm/lib/CodeGen/TwoAddressInstructionPass.cpp
@@ -1935,8 +1935,9 @@ eliminateRegSequence(MachineBasicBlock::iterator &MBBI) {
     for (unsigned i = 1, e = MI.getNumOperands(); i < e; i += 2)
       OrigRegs.push_back(MI.getOperand(i).getReg());
     if (LIS->hasInterval(DstReg)) {
-      DefVN = LIS->getInterval(DstReg).Query(
-        LIS->getInstructionIndex(MI)).valueOut();
+      DefVN = LIS->getInterval(DstReg)
+                  .Query(LIS->getInstructionIndex(MI))
+                  .valueOut();
     }
   }
 
@@ -2005,7 +2006,8 @@ eliminateRegSequence(MachineBasicBlock::iterator &MBBI) {
           unsigned SubReg = UseOp.getSubReg();
           if (UseOp.isUndef() || !SubReg)
             continue;
-          auto *VN = LI.getVNInfoAt(LIS->getInstructionIndex(*UseOp.getParent()));
+          auto *VN =
+              LI.getVNInfoAt(LIS->getInstructionIndex(*UseOp.getParent()));
           if (DefVN != VN)
             continue;
           LaneBitmask LaneMask = TRI->getSubRegIndexLaneMask(SubReg);

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https://github.com/llvm/llvm-project/pull/79286