Move code to new PR

Author: jakeegan

compiler-rt/lib/sanitizer_common/sanitizer_atomic_clang.h

@@ -14,18 +14,6 @@
 #ifndef SANITIZER_ATOMIC_CLANG_H
 #define SANITIZER_ATOMIC_CLANG_H
 
-// Helper to suppress warnings related to 8-byte atomic accesses when the target
-// is 32-bit AIX (where such accesses use libatomic).
-#if defined(_AIX) && !defined(__powerpc64__) && defined(__clang__)
-#  define SANITIZER_IGNORE_ATOMIC_ALIGNMENT_BEGIN \
-    _Pragma("clang diagnostic push")              \
-        _Pragma("clang diagnostic ignored \"-Watomic-alignment\"")
-#  define SANITIZER_IGNORE_ATOMIC_ALIGNMENT_END _Pragma("clang diagnostic pop")
-#else
-#  define SANITIZER_IGNORE_ATOMIC_ALIGNMENT_BEGIN
-#  define SANITIZER_IGNORE_ATOMIC_ALIGNMENT_END
-#endif
-
 namespace __sanitizer {
 
 // We use the compiler builtin atomic operations for loads and stores, which
@@ -47,8 +35,6 @@ inline void proc_yield(int cnt) {
 #endif
 }
 
-SANITIZER_IGNORE_ATOMIC_ALIGNMENT_BEGIN
-
 template <typename T>
 inline typename T::Type atomic_load(const volatile T *a, memory_order mo) {
   DCHECK(mo == memory_order_relaxed || mo == memory_order_consume ||
@@ -106,8 +92,6 @@ inline bool atomic_compare_exchange_weak(volatile T *a, typename T::Type *cmp,
   return atomic_compare_exchange_strong(a, cmp, xchg, mo);
 }
 
-SANITIZER_IGNORE_ATOMIC_ALIGNMENT_END
-
 }  // namespace __sanitizer
 
 #undef ATOMIC_ORDER