sanitizer-coverage vs asan_blacklist

[Timur Iskhodzhanov]

Kostya, Alexey,

I'm currently working on sanitizer coverage on Windows for Chromium.
As described in http://crbug.com/459166 , we currently blacklist some
sandbox code from ASan instrumentation, otherwise shadow memory is accessed
before the RTL is even loaded.
As it turns out, we should also disable coverage instrumentation for that
code, otherwise the guard variables are checked before the RTL is loaded.

That being said, the ASan blacklist should probably be used in the coverage
instrumentation module pass.  Or it should have a separate blacklist...

What do you think?
––
Timur
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