[PATCH] [Sanitizer] Fix report_path functionality:

[Alexey Samsonov]

Hi kcc, glider,

  - Make sure mmap() is never called inside RawWrite function.
  - Wrap a bunch of standalone globals in a ReportFile object.
  - Make sure accesses to these globals are thread-safe.
  - Fix report_path functionality on Windows, where
    __sanitizer_set_report_path() would break program.

I've started this yak shaving in order to make
"CommonFlags::mmap_limit_mb" immutable. Currently we drop this flag
to zero before printing an error message.

http://reviews.llvm.org/D6595

Files:
  lib/sanitizer_common/sanitizer_common.cc
  lib/sanitizer_common/sanitizer_common.h
  lib/sanitizer_common/sanitizer_common_libcdep.cc
  lib/sanitizer_common/sanitizer_posix.cc
  lib/sanitizer_common/sanitizer_win.cc

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