[PATCH] [sanitizer] Implement TwoLevelByteMap and use it for the internal allocator on 64-bit.

[Dmitry Vyukov]

  You're right.
  When I was reading this, I thought that you are mapping different subtables concurrently.

http://llvm-reviews.chandlerc.com/D2259

BRANCH
  svn

ARCANIST PROJECT
  compiler-rt