[clang] [llvm] [AArch64][clang][llvm] Add ACLE `stshh` atomic store builtin (PR #181386)

[Kerry McLaughlin via cfe-commits]

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@@ -840,6 +840,12 @@ __rndrrs(uint64_t *__p) {
 }
 #endif
 
+/* Atomic store with PCDPHINT */
+#if defined(__ARM_64BIT_STATE) && __ARM_64BIT_STATE
+#define __arm_atomic_store_with_stshh(ptr, data, memory_order, ret)            \
+  __builtin_arm_atomic_store_with_stshh((ptr), (data), (memory_order), (ret))
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kmclaughlin-arm wrote:

nit: extra brackets
```suggestion
  __builtin_arm_atomic_store_with_stshh(ptr, data, memory_order, ret)
```

https://github.com/llvm/llvm-project/pull/181386