Make asan blacklists optional

Default is still on but the use of blacklists for asan can be
disabled by setting asan_use_blacklist to false.

This is useful for distributed compilers such as icecc where
flags as -fsanitize-blacklist= pointing to a local source file
is not yet supported.

Bug: 818190
Change-Id: I828ada1142ef76ecc0f1ccad8bd41390f0cbceea
Reviewed-on: https://chromium-review.googlesource.com/c/946101
Commit-Queue: Joel Klinghed <the_jk@opera.com>
Reviewed-by: Max Moroz <mmoroz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#629534}
2 files changed