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

[Pengcheng Wang via cfe-commits]

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@@ -1886,6 +1886,12 @@ let TargetPrefix = "riscv" in {
   def int_riscv_vsm3me   : RISCVBinaryAAXUnMasked;
 } // TargetPrefix = "riscv"
 
+// Zihintpause extensions
+//===----------------------------------------------------------------------===//
+let TargetPrefix = "riscv" in {
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wangpc-pp wrote:

Same here.

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