[llvm] [X86] Remove `def32` and drop redundant zero extensions after `isel` (PR #225462)

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``````````bash
git-clang-format --diff origin/main HEAD --extensions cpp -- llvm/lib/Target/X86/X86ISelDAGToDAG.cpp --diff_from_common_commit
``````````

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View the diff from clang-format here.
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``````````diff
diff --git a/llvm/lib/Target/X86/X86ISelDAGToDAG.cpp b/llvm/lib/Target/X86/X86ISelDAGToDAG.cpp
index dda4cabc7..ecd288404 100644
--- a/llvm/lib/Target/X86/X86ISelDAGToDAG.cpp
+++ b/llvm/lib/Target/X86/X86ISelDAGToDAG.cpp
@@ -1860,8 +1860,8 @@ void X86DAGToDAGISel::PostprocessISelDAG() {
         if (Move.getMachineOpcode() != X86::MOV32rr ||
             !isDef32(Move.getOperand(0)))
           continue;
-        SDNode *Res = CurDAG->UpdateNodeOperands(N, Move.getOperand(0),
-                                                 N->getOperand(1));
+        SDNode *Res =
+            CurDAG->UpdateNodeOperands(N, Move.getOperand(0), N->getOperand(1));
         if (Res != N)
           ReplaceUses(N, Res);
         MadeChange = true;

``````````

</details>


https://github.com/llvm/llvm-project/pull/225462