[X86] getConstVector - use APInt::extractBits instead of shift+mask. NFC.

Author: RKSimon

llvm/lib/Target/X86/X86ISelLowering.cpp

@@ -4001,8 +4001,8 @@ static SDValue getConstVector(ArrayRef<APInt> Bits, const APInt &Undefs,
     const APInt &V = Bits[i];
     assert(V.getBitWidth() == VT.getScalarSizeInBits() && "Unexpected sizes");
     if (Split) {
-      Ops.push_back(DAG.getConstant(V.trunc(32), dl, EltVT));
-      Ops.push_back(DAG.getConstant(V.lshr(32).trunc(32), dl, EltVT));
+      Ops.push_back(DAG.getConstant(V.extractBits(32, 0), dl, EltVT));
+      Ops.push_back(DAG.getConstant(V.extractBits(32, 32), dl, EltVT));
     } else if (EltVT == MVT::f32) {
       APFloat FV(APFloat::IEEEsingle(), V);
       Ops.push_back(DAG.getConstantFP(FV, dl, EltVT));