[PATCH] [LSan] Make parent tool responsible for initializing LSan flags.

[Alexey Samsonov]

Hi earthdok, eugenis,

LSan can be combined with a parent tool (for now it's only ASan).
Also, we allow LSAN_OPTIONS to override certain common flags. It means
we have to parse LSAN_OPTIONS early enough, before the rest of the
parent tool (including chunks of sanitizer_common) is initialized.

In future, we can use the same approach for UBSan, after we embed it
into ASan runtime in a similar way.

http://reviews.llvm.org/D7577

Files:
  lib/asan/asan_flags.cc
  lib/asan/asan_rtl.cc
  lib/lsan/lsan.cc
  lib/lsan/lsan_common.cc
  lib/lsan/lsan_common.h

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