[PATCH] [MSan] [MIPS] Adding support for MIPS64

[Mohit Bhakkad]

> How exactly did you verify it? 
>Did you run any large programs that consume gigs of RAM? 
>I still doubt this will work.
MIPS is generally used in embedded, which may not require gigs of RAM.
Till now, I have just ran the testcases on mips rpe-100 board, and majority of it are passing.
For real world testing, I have tried MSan on nano editor, which is also working fine.
I will be testing it with some larger application, and will update you with the results. 
Any suggestions?

http://reviews.llvm.org/D5906