[RISCV] Use more precise type constraints for the vmv.v.v and vmv.v.x intrinsics.

We can infer the input type from the result type. For vmv.v.v its
the same. For vmv.v.x its the element type.

Author: topperc

llvm/include/llvm/IR/IntrinsicsRISCV.td

@@ -294,14 +294,6 @@ let TargetPrefix = "riscv" in {
     let ExtendOperand = 3;
   }
 
-  // For vmv.v.v, vmv.v.x, vmv.v.i
-  // Input: (vector_in/scalar_in, vl)
-  class RISCVUnary : Intrinsic<[llvm_anyvector_ty],
-                               [llvm_any_ty, llvm_anyint_ty],
-                               [IntrNoMem] >, RISCVVIntrinsic {
-    let ExtendOperand = 1;
-  }
-
   class RISCVTernaryAAAXNoMask
         : Intrinsic<[llvm_anyvector_ty],
                     [LLVMMatchType<0>, LLVMMatchType<0>, llvm_anyint_ty,
@@ -440,8 +432,14 @@ let TargetPrefix = "riscv" in {
   defm vssubu : RISCVSaturatingBinaryAAX;
   defm vssub : RISCVSaturatingBinaryAAX;
 
-  def int_riscv_vmv_v_v : RISCVUnary;
-  def int_riscv_vmv_v_x : RISCVUnary;
+  def int_riscv_vmv_v_v : Intrinsic<[llvm_anyvector_ty],
+                                    [LLVMMatchType<0>, llvm_anyint_ty],
+                                    [IntrNoMem]>, RISCVVIntrinsic;
+  def int_riscv_vmv_v_x : Intrinsic<[llvm_anyint_ty],
+                                    [LLVMVectorElementType<0>, llvm_anyint_ty],
+                                    [IntrNoMem]>, RISCVVIntrinsic {
+    let ExtendOperand = 1;
+  }
 
   def int_riscv_vmv_x_s : Intrinsic<[LLVMVectorElementType<0>],
                                     [llvm_anyint_ty],