[clang] [clang] Define ATOMIC_FLAG_INIT correctly for C++. (PR #97534)

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``````````bash
git-clang-format --diff 690ecee40cd2f3d6655af09272c89a2ea15ada60 34a618e2ac88291cf44b84f1c22cddefdb34bc29 -- clang/lib/Headers/stdatomic.h
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View the diff from clang-format here.
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``````````diff
diff --git a/clang/lib/Headers/stdatomic.h b/clang/lib/Headers/stdatomic.h
index 88172038be..51a5d004e8 100644
--- a/clang/lib/Headers/stdatomic.h
+++ b/clang/lib/Headers/stdatomic.h
@@ -167,7 +167,7 @@ typedef _Atomic(uintmax_t)          atomic_uintmax_t;
 typedef struct atomic_flag { atomic_bool _Value; } atomic_flag;
 
 #ifdef __cplusplus
-#define ATOMIC_FLAG_INIT { false }
+#define ATOMIC_FLAG_INIT {false}
 #else
 #define ATOMIC_FLAG_INIT { 0 }
 #endif

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https://github.com/llvm/llvm-project/pull/97534