[PATCH] A workaround for getting process memory map taking too long for sanitizers on FreeBSD

[Viktor Kutuzov]

Two changes:
* common Linux/FreeBSD parts moved out to sanitizer_procmaps_common.cc and
* the workaround code now ignore the header map entry that correspond to the whole available memory range.

With this patch we pass x86-64 Asan unit tests on FreeBSD.

http://reviews.llvm.org/D3732

Files:
  lib/sanitizer_common/CMakeLists.txt
  lib/sanitizer_common/sanitizer_procmaps.h
  lib/sanitizer_common/sanitizer_procmaps_common.cc
  lib/sanitizer_common/sanitizer_procmaps_freebsd.cc
  lib/sanitizer_common/sanitizer_procmaps_linux.cc
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