[PATCH] [ASan] Add process basename to log name and error message to simplify analysis of sanitized systems logs.

[Yury Gribov]

Hi kcc, samsonov,

This is a second try on http://reviews.llvm.org/D5724 which was approved and commited but later reverted after causing bugs in upstream. This patch is mostly identical (except for fixing the issue for OSX and rebasing). It relies on BlockinMutex patch in http://reviews.llvm.org/D7171

REPOSITORY
  rL LLVM

http://reviews.llvm.org/D7172

Files:
  lib/asan/asan_report.cc
  lib/msan/msan_interceptors.cc
  lib/sanitizer_common/sanitizer_common.cc
  lib/sanitizer_common/sanitizer_common.h
  lib/sanitizer_common/sanitizer_flags.inc
  lib/sanitizer_common/sanitizer_linux.cc
  lib/sanitizer_common/sanitizer_linux.h
  lib/sanitizer_common/sanitizer_mac.cc
  lib/sanitizer_common/sanitizer_printf.cc
  lib/sanitizer_common/sanitizer_symbolizer_posix_libcdep.cc
  lib/sanitizer_common/sanitizer_win.cc
  test/asan/TestCases/verbose-log-path_test.cc
  test/asan/lit.cfg

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