[PATCH] Split Mprotect into MmapNoAccess and MprotectNoAccess to be more portable

[Timur Iskhodzhanov]

Hi glider,

On Windows, we have to know if a memory to be protected is mapped or not.
On POSIX, `Mprotect` was semantically different from `mprotect` most people know.

http://reviews.llvm.org/D8970

Files:
  lib/asan/asan_rtl.cc
  lib/dfsan/dfsan.cc
  lib/msan/msan_linux.cc
  lib/sanitizer_common/sanitizer_allocator.h
  lib/sanitizer_common/sanitizer_common.h
  lib/sanitizer_common/sanitizer_coverage_libcdep.cc
  lib/sanitizer_common/sanitizer_linux.cc
  lib/sanitizer_common/sanitizer_mac.cc
  lib/sanitizer_common/sanitizer_posix.cc
  lib/sanitizer_common/sanitizer_posix.h
  lib/sanitizer_common/sanitizer_stoptheworld_linux_libcdep.cc
  lib/sanitizer_common/sanitizer_win.cc
  lib/sanitizer_common/tests/sanitizer_stacktrace_test.cc
  lib/tsan/rtl/tsan_platform_linux.cc

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