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

[Kumar Sukhani]

@earthdok: I am not sure if mips stores the value of pthread struct size anywhere the way x86 does to write a UNIT test for pthread struct size.
Btw why x86_64 is using the hard codes values, even though they have direct access to pthread structure size?

http://reviews.llvm.org/D5616