[PATCH] Improve collecting malloc stats in ASan

[Alexey Samsonov]

  Add a forgotten test case. It is hard to make it expose the data
  race reliably. W/o this change it fails at about 25% runs.

Hi kcc,

http://llvm-reviews.chandlerc.com/D1572

CHANGE SINCE LAST DIFF
  http://llvm-reviews.chandlerc.com/D1572?vs=3962&id=3963#toc

Files:
  lib/asan/lit_tests/TestCases/current_allocated_bytes.cc
  lib/asan/asan_stats.cc
  lib/asan/asan_thread.cc
  lib/asan/asan_stats.h
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