[clang] [llvm] [RISC-V] Added the mips extension instructions like ehb,ihb and pause etc for MIPS RV64 P8700. (PR #155747)

[Craig Topper via llvm-commits]

================
@@ -146,7 +161,7 @@ let Predicates = [HasVendorXMIPSCBOP] in {
 }
 
 let Predicates = [HasVendorXMIPSCMov], hasSideEffects = 0, mayLoad = 0, mayStore = 0,
-                 DecoderNamespace = "Xmipscmov" in {
+                 DecoderNamespace = "XMIPS" in {
----------------
topperc wrote:

```suggestion
    DecoderNamespace = "XMIPS" in {
```

https://github.com/llvm/llvm-project/pull/155747