[PATCH] [MSan][Clang][MIPS] Enabled memory, dataflow and thread options for MIPS platform

[Alexey Samsonov]

I'm fine with the change, although I'd rather roll it gradually. First land the part for MSan/DFSan (which are already supported on MIPS), then TSan and `-fsanitize=function` when they passes the review.

http://reviews.llvm.org/D6147