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

[Craig Topper 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 {
----------------
topperc wrote:

This should have `Attributes = [NoThrow]`. Zihintntl should too, but that's for 
a different patch.

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