[PATCH] [asan] [mips] added support of asan for mips64/mips64el

[Kumar Sukhani]

@kcc: As mentioned here[1], whether 16TB of memory is must for asan64 ?
Because test-cases in compiler-rt are working fine.
Now I am planning to build some big application with asan which require GBs of memory.

[1] http://clang.llvm.org/docs/AddressSanitizer.html#limitations

http://reviews.llvm.org/D6024