[PATCH] [compiler-rt] Turn abort_on_error=1 by default on OS X (part 1/2)

[Yury Gribov]

> What about adding a clang driver flag -fsanitize-abort-on-error that will link an extra object?


Instead of limiting ourselves to abort-on-error, can this instead be -fsanitize-default-options=? But we'll need something more complicated than just another object file.


http://reviews.llvm.org/D7203

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