[clang] [llvm] [RISCV] Support spacemit vsmtvdotii externsions (PR #202533)

[Luke Lau via cfe-commits]

================
@@ -1379,6 +1425,8 @@ static MCRegister convertVRToVRMx(const MCRegisterInfo &RI, MCRegister Reg,
   unsigned RegClassID;
   if (Kind == MCK_VRM2)
     RegClassID = RISCV::VRM2RegClassID;
+  else if (Kind == MCK_VRM2NoV0)
+    RegClassID = RISCV::VRM2NoV0RegClassID;
----------------
lukel97 wrote:

Is this still needed? It doesn't look like VRM2NoV0 is used by the instructions anymore

https://github.com/llvm/llvm-project/pull/202533