[X86] combineConcatVectorOps - remove superfluous Subtarget.hasAVX() check

This function only ever gets called by AVX targets, and we already assert for this at the top of the function

Author: RKSimon

llvm/lib/Target/X86/X86ISelLowering.cpp

@@ -52552,7 +52552,7 @@ static SDValue combineConcatVectorOps(const SDLoc &DL, MVT VT,
       LLVM_FALLTHROUGH;
     case X86ISD::VPERMILPI:
       if (!IsSplat && NumOps == 2 && (VT == MVT::v8f32 || VT == MVT::v8i32) &&
-          Subtarget.hasAVX() && Op0.getOperand(1) == Ops[1].getOperand(1)) {
+          Op0.getOperand(1) == Ops[1].getOperand(1)) {
         SDValue Res = DAG.getBitcast(MVT::v8f32, ConcatSubOperand(VT, Ops, 0));
         Res = DAG.getNode(X86ISD::VPERMILPI, DL, MVT::v8f32, Res,
                           Op0.getOperand(1));