[compiler-rt] [asan] Implement address sanitizer on AIX: shadow memory (PR #136874)

[Vitaly Buka via llvm-commits]

================
@@ -19,6 +19,29 @@
 #  include "asan_internal.h"
 #  include "asan_mapping.h"
 
+#  if SANITIZER_AIX == 1 && SANITIZER_WORDSIZE == 64
+#    define HANDLE_SHADOW_GAP()                                    \
----------------
vitalybuka wrote:

why it's need to be macro?

https://github.com/llvm/llvm-project/pull/136874