[RISCV] Use non-vp select in RISCVGatherScatterLowering. NFCish (llvm#157071)

Similar to llvm#157070 and llvm#157068, let RISCVVLOptimizer do the work.

Author: lukel97

llvm/lib/Target/RISCV/RISCVGatherScatterLowering.cpp

@@ -561,7 +561,7 @@ bool RISCVGatherScatterLowering::tryCreateStridedLoadStore(IntrinsicInst *II) {
     EVL = Builder.CreateElementCount(
         Builder.getInt32Ty(), cast<VectorType>(DataType)->getElementCount());
 
-  CallInst *Call;
+  Value *Call;
 
   if (!StoreVal) {
     Call = Builder.CreateIntrinsic(
@@ -571,8 +571,7 @@ bool RISCVGatherScatterLowering::tryCreateStridedLoadStore(IntrinsicInst *II) {
 
     // Merge llvm.masked.gather's passthru
     if (II->getIntrinsicID() == Intrinsic::masked_gather)
-      Call = Builder.CreateIntrinsic(Intrinsic::vp_select, {DataType},
-                                     {Mask, Call, II->getArgOperand(3), EVL});
+      Call = Builder.CreateSelect(Mask, Call, II->getArgOperand(3));
   } else
     Call = Builder.CreateIntrinsic(
         Intrinsic::experimental_vp_strided_store,