[cfe-commits] Add the support for AddressSanitizer on Darwin into the driver.

[Alexander Potapenko]

See the attachment.

For Darwin executables we do the same thing as for Linux (see addASanRTLinux)
For Darwin shared libraries we need to explicitly mark the interface
functions inserted by ASan as dynamic_lookup, otherwise we'll get a
linker error.
Another solution is to pass "--undefined dynamic_lookup" to the
linker, but this won't allow the users to notice their own undefined
symbols.

WBR,
Alexander Potapenko
Software Engineer
Google Moscow
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