[compiler-rt] [asan] Implement address sanitizer on AIX: build configuration (PR #139583)

[Hubert Tong via llvm-commits]

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@@ -382,10 +384,21 @@ else()
       endif()
     endif()
   endforeach()
+  endif()
 endif()
 
 add_compiler_rt_resource_file(asan_ignorelist asan_ignorelist.txt asan)
 
+# On AIX, static sanitizer libraries are not added to the DSO, so we need to put 
+# asan.link_with_main_exec.txt and asan_cxx.link_with_main_exec.txt to the build
+# and install dir to resolve undefined sanitizer symbols at runtime.
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hubert-reinterpretcast wrote:

Wording nit: Technically, just adding the files doesn't solve the problem.
```suggestion
# and install dir for use in resolving undefined sanitizer symbols at runtime.
```

https://github.com/llvm/llvm-project/pull/139583