[clang] [llvm] [RISCV] Add MIPS extensions (PR #121394)

[Craig Topper via llvm-commits]

================
@@ -514,6 +514,80 @@ class RVInstJ<RISCVOpcode opcode, dag outs, dag ins, string opcodestr,
   let Inst{6-0} = opcode.Value;
 }
 
+//===----------------------------------------------------------------------===//
----------------
topperc wrote:

Can we keep these in the MIPS file?

https://github.com/llvm/llvm-project/pull/121394