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

[Alexey Samsonov]

================
Comment at: lib/Driver/ToolChains.cpp:385
@@ -383,1 +384,3 @@
+      if (Sanitize.sanitizesVptr())
+        CmdArgs.push_back("-lc++abi");
     }
----------------
kledzik wrote:
> Nothing should be linking directly with libc++abi.dylib.  C++ code should link with libc++.dylib or libstdc++.dylib.  I think there is some other setting in the clang driver that controls which to link with.  But just linking with -lc++ will be right most of the time.
What if chooses to provide -lstdc++? In that case we still need to get RTTI for `__cxxabiv1::__class_type_info` from somewhere...
(see http://llvm.org/bugs/show_bug.cgi?id=21424).

http://reviews.llvm.org/D6960

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