[PATCH] [Msan] Generalize mapping facilities to add FreeBSD support

[Viktor Kutuzov]

Updated:
* TakeMapRange() is split into two different functions;
* The prot1 and prot2 parameters removed;
* The kShadowSize value fixed;
* A minor fix for the code-in-app-range check.

http://reviews.llvm.org/D6387

Files:
  lib/msan/msan.cc
  lib/msan/msan.h
  lib/msan/msan_interceptors.cc
  lib/msan/msan_linux.cc
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