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

[Kumar Sukhani]

> What commands do you use to configure and build?
```
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 install
make check-all
```

Clang path : /home/kms/LLVM_x86/install/bin/clang
make check-sanitizer output: https://gist.github.com/SDkie/6d2013b72ea67d77d094

http://reviews.llvm.org/D5616