[PATCH] [lsan] [mips] adding support of lsan for mips64/mips64el arch

[Kumar Sukhani]

@earthdok: with check-sanitizer also I see no failures because of above changes in assertion.

Can you please commit this current version of patch ? if no more changes are require
I will update lib/sanitizer_common/tests/sanitizer_linux_test.cc file so that same check works for mips.
What do you think ?

http://reviews.llvm.org/D5616