[PATCH] Support re-exec of sanitized executable with preloading libasan on Linux

[Maria Guseva]

Hi glider, kcc, samsonov,

Currently if we want to run sanitized shared library in unsanitized executable we have to run executable with LD_PRELOAD=libasan.so which may be inconvenient for users (have to modify startup scripts, etc.). The patch implements reexecuting of the program with modified LD_PRELOAD environment variable on Linux. The same functionality is already supported for Mac Asan.
The corresponding issue link: https://code.google.com/p/address-sanitizer/issues/detail?id=330

http://reviews.llvm.org/D5931

Files:
  lib/asan/asan_flags.h
  lib/asan/asan_internal.h
  lib/asan/asan_linux.cc
  lib/asan/asan_mac.cc
  lib/asan/asan_rtl.cc
  lib/asan/asan_win.cc
  lib/sanitizer_common/sanitizer_common.h
  lib/sanitizer_common/sanitizer_flags.cc
  lib/sanitizer_common/sanitizer_flags.h
  lib/sanitizer_common/sanitizer_linux.cc
  test/asan/TestCases/Linux/asan_dlopen_test.cc
  test/asan/TestCases/Linux/asan_reexec_test-1.cc
  test/asan/TestCases/Linux/asan_reexec_test-2.cc
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