[compiler-rt] [asan] Implement interception on AIX (PR #131870)

[Hubert Tong via llvm-commits]

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@@ -84,12 +97,19 @@ void InitializePlatformInterceptors();
 #    define ASAN_INTERCEPT__UNWIND_SJLJ_RAISEEXCEPTION 0
 #  endif
 
-#  if !SANITIZER_WINDOWS
+// AIX currently can't retrieve the address of __cxa_atexit
+#  if !SANITIZER_WINDOWS && !SANITIZER_AIX
 #    define ASAN_INTERCEPT___CXA_ATEXIT 1
 #  else
 #    define ASAN_INTERCEPT___CXA_ATEXIT 0
 #  endif
 
+#  if SANITIZER_AIX
+#    define ASAN_INTERCEPT_EXIT 1
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hubert-reinterpretcast wrote:

What is special about AIX that we need it for AIX and not other platforms? What happens on AIX if we don't have this?

https://github.com/llvm/llvm-project/pull/131870