[llvm] Lower UCMP and SCMP directly to setb instead of matching the dag shape (PR #206282)

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``````````bash
git-clang-format --diff origin/main HEAD --extensions cpp -- llvm/lib/Target/PowerPC/PPCISelDAGToDAG.cpp llvm/lib/Target/PowerPC/PPCISelLowering.cpp --diff_from_common_commit
``````````

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``````````diff
diff --git a/llvm/lib/Target/PowerPC/PPCISelDAGToDAG.cpp b/llvm/lib/Target/PowerPC/PPCISelDAGToDAG.cpp
index e55fa93af..3dc4b5342 100644
--- a/llvm/lib/Target/PowerPC/PPCISelDAGToDAG.cpp
+++ b/llvm/lib/Target/PowerPC/PPCISelDAGToDAG.cpp
@@ -4692,7 +4692,6 @@ void PPCDAGToDAGISel::transferMemOperands(SDNode *N, SDNode *Result) {
   CurDAG->setNodeMemRefs(cast<MachineSDNode>(Result), {MemOp});
 }
 
-
 // Return true if it's a software square-root/divide operand.
 static bool isSWTestOp(SDValue N) {
   if (N.getOpcode() == PPCISD::FTSQRT)
@@ -5737,7 +5736,6 @@ void PPCDAGToDAGISel::Select(SDNode *N) {
     if (Subtarget->useCRBits() && N->getOperand(0).getValueType() == MVT::i1)
       break;
 
-
     // Handle the setcc cases here.  select_cc lhs, 0, 1, 0, cc
     if (!isPPC64 && isNullConstant(N->getOperand(1)) &&
         isOneConstant(N->getOperand(2)) && isNullConstant(N->getOperand(3)) &&

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https://github.com/llvm/llvm-project/pull/206282