Otherwise, if llvm is built with assertion on,
we will hit the following error for a simple trace.py script like
  -bash-4.4$ sudo ./trace.py 'SyS_nanosleep'
  python: /home/yhs/work/llvm/lib/ExecutionEngine/MCJIT/MCJIT.cpp:204:
          virtual void llvm::MCJIT::generateCodeForModule(llvm::Module*):
          Assertion `M->getDataLayout() == getDataLayout() && "DataLayout Mismatch"'
          failed.
  Aborted (core dumped)
  -bash-4.4$
Signed-off-by: Yonghong Song <yhs@fb.com>