[compiler-rt] [sanitizer_common][AIX] Use scoped pragma to suppress atomic alignment warnings (PR #139272)

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``````````bash
git-clang-format --diff HEAD~1 HEAD --extensions h -- compiler-rt/lib/sanitizer_common/sanitizer_atomic_clang.h
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View the diff from clang-format here.
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``````````diff
diff --git a/compiler-rt/lib/sanitizer_common/sanitizer_atomic_clang.h b/compiler-rt/lib/sanitizer_common/sanitizer_atomic_clang.h
index c2b106015..fded66546 100644
--- a/compiler-rt/lib/sanitizer_common/sanitizer_atomic_clang.h
+++ b/compiler-rt/lib/sanitizer_common/sanitizer_atomic_clang.h
@@ -17,13 +17,13 @@
 // 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")
+#  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
+#  define SANITIZER_IGNORE_ATOMIC_ALIGNMENT_BEGIN
+#  define SANITIZER_IGNORE_ATOMIC_ALIGNMENT_END
 #endif
 
 namespace __sanitizer {

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https://github.com/llvm/llvm-project/pull/139272