[clang] [llvm] [RISCV] Add `zihintpause` LLVM/Clang intrinsic (PR #139519)

[Iris Shi via cfe-commits]

================
@@ -147,6 +147,13 @@ def ntl_load : RISCVBuiltin<"void(...)">;
 def ntl_store : RISCVBuiltin<"void(...)">;
 } // Features = "zihintntl", Attributes = [CustomTypeChecking]
 
+//===----------------------------------------------------------------------===//
+// Zihintpause extension.
+//===----------------------------------------------------------------------===//
+let Features = "zihintpause" in {
+def pause : RISCVBuiltin<"void(...)">;
+} // Features = "zihintntl"
----------------
el-ev wrote:

```suggestion
} // Features = "zihintpause"
```

https://github.com/llvm/llvm-project/pull/139519
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