[PATCH] Add an experimental Sanitizer Windows builder

[Timur Iskhodzhanov]

Addressed the latest review comments and committed as r229537.
Can you please restart the master and see how it goes?
I'll update the slave to 0.8.9+ tomorrow and will start babysitting it to make it green.

Thanks a lot for a thorough review!


http://reviews.llvm.org/D7675

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