[compiler-rt] [asan][Darwin] Use Apples blocks extension only when supported (#72639) (PR #72642)

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git-clang-format --diff ec42d547eba5c0ad0bddbecc8902d35383968e78 4c03cd3fa7dbeca64002372596f4cffdfa50ecdb -- compiler-rt/lib/asan/asan_mac.cpp
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View the diff from clang-format here.
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diff --git a/compiler-rt/lib/asan/asan_mac.cpp b/compiler-rt/lib/asan/asan_mac.cpp
index 6252fa20d5..1b0e9b3fe0 100644
--- a/compiler-rt/lib/asan/asan_mac.cpp
+++ b/compiler-rt/lib/asan/asan_mac.cpp
@@ -139,11 +139,11 @@ typedef void (*dispatch_mach_handler_function_t)(void *context,
                                                  dispatch_mach_reason reason,
                                                  dispatch_mach_msg_t message,
                                                  mach_error_t error);
-#if !defined(MISSING_BLOCKS_SUPPORT)
+#  if !defined(MISSING_BLOCKS_SUPPORT)
 typedef void (^dispatch_mach_handler_t)(dispatch_mach_reason reason,
                                         dispatch_mach_msg_t message,
                                         mach_error_t error);
-#endif
+#  endif
 
 // A wrapper for the ObjC blocks used to support libdispatch.
 typedef struct {

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https://github.com/llvm/llvm-project/pull/72642