[PATCH] msvcr120: Fixed a race condition in Concurrency::critical_section.

[Yifu Wang]

Fixed a race condition which could corrupt the critical_section data structure and causes critical_section_unlock() to hang. See comment in patch for detail.
Added a simple testcase for critical_section.
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 dlls/msvcr120/tests/msvcr120.c |  133 +++++++++++++++++++++++++++++++++++++---
 dlls/msvcrt/lock.c             |   22 ++++++-
 2 files changed, 145 insertions(+), 10 deletions(-)
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