[RISCV][NFC] Merge the isolated decleration into foreach.

llvm/lib/Target/RISCV/RISCVInstrInfoV.td

 
 // Vector Compress Instruction
 let Constraints = "@earlyclobber $vd", RVVConstraint = Vcompress in {
 defm VCOMPRESS_V : VCPR_MV_Mask<"vcompress", 0b010111>;
 } // Constraints = "@earlyclobber $vd", RVVConstraint = Vcompress
 
 let hasSideEffects = 0, mayLoad = 0, mayStore = 0,
     RVVConstraint = NoConstraint in {
-def VMV1R_V  : RVInstV<0b100111, 0, OPIVI, (outs VR:$vd), (ins VR:$vs2),
-                       "vmv1r.v", "$vd, $vs2">, VMVRSched<1> {
-  let Uses = [];
-  let vm = 1;
-}
 // A future extension may relax the vector register alignment restrictions.
-foreach n = [2, 4, 8] in {
-  defvar vrc = !cast<VReg>("VRM"#n);
+foreach n = [1, 2, 4, 8] in {
+  defvar vrc = !cast<VReg>(!if(!eq(n, 1), "VR", "VRM"#n));
   def VMV#n#R_V  : RVInstV<0b100111, !add(n, -1), OPIVI, (outs vrc:$vd),
                            (ins vrc:$vs2), "vmv" # n # "r.v", "$vd, $vs2">,
                    VMVRSched<n> {
     let Uses = [];
     let vm = 1;
   }
 }
 } // hasSideEffects = 0, mayLoad = 0, mayStore = 0