[PATCH] Always add -lc++abi when using vptr sanitizer on Darwin.

[kledzik at apple.com]

It will just work.  libstdc++.dylib re-exports symbols from libc++abi.dylib:

[/tmp]> dyldinfo -export /usr/lib/libstdc++.dylib | grep __class_type_info 
[re-export] __ZTVN10__cxxabiv117__class_type_infoE (from libc++abi)
[re-export] __ZTSN10__cxxabiv117__class_type_infoE (from libc++abi)
[re-export] __ZTVN10__cxxabiv117__class_type_infoE (from libc++abi)
[re-export] __ZTSN10__cxxabiv117__class_type_infoE (from libc++abi)
[/tmp]>


http://reviews.llvm.org/D6960

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