[PATCH] [asancov] Write coverage directly to a memory-mapped file

[Evgeniy Stepanov]

Hi kcc, dvyukov,

This way does not require a __sanitizer_cov_dump() call. That's important on Android, where apps can be killed at arbitrary time.

We write raw PCs to disk instead of module offsets; we also write memory layout to a separate file. This increases dump size by the factor of 2 on 64-bit systems.

http://reviews.llvm.org/D3874

Files:
  lib/asan/asan_interceptors.cc
  lib/sanitizer_common/CMakeLists.txt
  lib/sanitizer_common/sanitizer_common.h
  lib/sanitizer_common/sanitizer_common_interceptors.inc
  lib/sanitizer_common/sanitizer_coverage.cc
  lib/sanitizer_common/sanitizer_coverage_direct.cc
  lib/sanitizer_common/sanitizer_coverage_direct.h
  lib/sanitizer_common/sanitizer_flags.cc
  lib/sanitizer_common/sanitizer_flags.h
  lib/sanitizer_common/sanitizer_libc.h
  lib/sanitizer_common/sanitizer_linux.cc
  lib/sanitizer_common/sanitizer_platform_interceptors.h
  lib/sanitizer_common/sanitizer_posix.cc
  lib/sanitizer_common/scripts/sancov.py
  lib/tsan/rtl/tsan_interceptors.cc
  test/asan/TestCases/Linux/coverage-direct-large.cc
  test/asan/TestCases/Linux/coverage-direct.cc
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