[PATCH] [sanitizer] Support sandboxing in sanitizer coverage.

[Sergey Matveev]

  - whitespace
  - address comments
  - use c++ initializer
  - add test
  - do not leave files after test
  - use intptr_t for fd

http://reviews.llvm.org/D3726

Files:
  include/sanitizer/common_interface_defs.h
  lib/sanitizer_common/sanitizer_common.cc
  lib/sanitizer_common/sanitizer_common.h
  lib/sanitizer_common/sanitizer_coverage.cc
  lib/sanitizer_common/sanitizer_internal_defs.h
  lib/sanitizer_common/sanitizer_linux.cc
  lib/sanitizer_common/sanitizer_mac.cc
  lib/sanitizer_common/sanitizer_win.cc
  lib/sanitizer_common/scripts/sancov.py
  test/asan/TestCases/Linux/coverage-sandboxing.cc
  test/asan/lit.cfg
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