fix format

Author: Shoreshen

llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp

@@ -5570,6 +5570,8 @@ bool SelectionDAG::canCreateUndefOrPoison(SDValue Op, const APInt &DemandedElts,
   case ISD::BUILD_PAIR:
   case ISD::SPLAT_VECTOR:
   case ISD::FABS:
+    return false;
+
   case ISD::ABS:
     // ISD::ABS defines abs(INT_MIN) -> INT_MIN and never generates poison.
     // Different to Intrinsic::abs.