[cfe-commits] Do not link dynamic libraries with the AddressSanitizer runtime

[Alexander Potapenko]

This patch makes sure that only executables are linked with the ASan
runtime library.
Otherwise we may end up having several instances of the runtime
library, which will lead to a mess.

Also, when building a dynamic library or a bundle with ASan, we need
to mark the undefined symbols added by the instrumentation pass as
dynamic_lookup to avoid linker errors.

-- 
Alexander Potapenko
Software Engineer
Google Moscow
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