[PATCH] Fix getting IP, BP and SP for address sanitizer's needs on FreeBSD in 32-bit mode

[Alexey Samsonov]

Oh, FreeBSD 9.2 (sigh). In general, I'm fine with this change, but wonder if we can put these FreeBSD hacks into a separate freebsd-specific inc file. Kostya, WDYT?

http://reviews.llvm.org/D3936