[X86] LowerABS - use DAG::getNegative() helper. NFC.

Author: RKSimon

llvm/lib/Target/X86/X86ISelLowering.cpp

@@ -28151,9 +28151,8 @@ static SDValue LowerABS(SDValue Op, const X86Subtarget &Subtarget,
   // ABS(vXi64 X) --> VPBLENDVPD(X, 0-X, X).
   if ((VT == MVT::v2i64 || VT == MVT::v4i64) && Subtarget.hasSSE41()) {
     SDValue Src = Op.getOperand(0);
-    SDValue Sub =
-        DAG.getNode(ISD::SUB, DL, VT, DAG.getConstant(0, DL, VT), Src);
-    return DAG.getNode(X86ISD::BLENDV, DL, VT, Src, Sub, Src);
+    SDValue Neg = DAG.getNegative(Src, DL, VT);
+    return DAG.getNode(X86ISD::BLENDV, DL, VT, Src, Neg, Src);
   }
 
   if (VT.is256BitVector() && !Subtarget.hasInt256()) {