[llvm] [SystemZ] Add DAGCombine for FCOPYSIGN to remove rounding. (PR #136131)

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``````````bash
git-clang-format --diff HEAD~1 HEAD --extensions cpp,h -- llvm/lib/Target/SystemZ/SystemZISelLowering.cpp llvm/lib/Target/SystemZ/SystemZISelLowering.h
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View the diff from clang-format here.
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``````````diff
diff --git a/llvm/lib/Target/SystemZ/SystemZISelLowering.cpp b/llvm/lib/Target/SystemZ/SystemZISelLowering.cpp
index 4823756a2..1bd967eb2 100644
--- a/llvm/lib/Target/SystemZ/SystemZISelLowering.cpp
+++ b/llvm/lib/Target/SystemZ/SystemZISelLowering.cpp
@@ -8549,8 +8549,8 @@ SDValue SystemZTargetLowering::combineINT_TO_FP(
   return SDValue();
 }
 
-SDValue SystemZTargetLowering::combineFCOPYSIGN(
-    SDNode *N, DAGCombinerInfo &DCI) const {
+SDValue SystemZTargetLowering::combineFCOPYSIGN(SDNode *N,
+                                                DAGCombinerInfo &DCI) const {
   SelectionDAG &DAG = DCI.DAG;
   EVT VT = N->getValueType(0);
   SDValue ValOp = N->getOperand(0);
@@ -9154,7 +9154,8 @@ SDValue SystemZTargetLowering::PerformDAGCombine(SDNode *N,
   case ISD::FP_EXTEND:          return combineFP_EXTEND(N, DCI);
   case ISD::SINT_TO_FP:
   case ISD::UINT_TO_FP:         return combineINT_TO_FP(N, DCI);
-  case ISD::FCOPYSIGN:          return combineFCOPYSIGN(N, DCI);
+  case ISD::FCOPYSIGN:
+    return combineFCOPYSIGN(N, DCI);
   case ISD::BSWAP:              return combineBSWAP(N, DCI);
   case ISD::SETCC:              return combineSETCC(N, DCI);
   case SystemZISD::BR_CCMASK:   return combineBR_CCMASK(N, DCI);

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https://github.com/llvm/llvm-project/pull/136131