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

[Kumar Sukhani]

I am using following commands:

```
CC=clang CXX=clang++  cmake ../compiler-rt -DLLVM_CONFIG_PATH=/home/kms/LLVM_x86/install/bin/llvm-config  -DCOMPILER_RT_INSTALL_PATH=/home/kms/LLVM_x86/install/lib/clang/3.6.0
make
make install
make check-sanitizer
```

http://reviews.llvm.org/D5616