Fix a llvm compilation error

Fix a llvm compilation error

With latest llvm16, I got the following compilation error:
  /.../src/cc/bpf_module.cc: In member function ‘void ebpf::BPFModule::dump_ir(llvm::Module&)’:
  /.../src/cc/bpf_module.cc:259:15: error: ‘PrintModulePass’ was not declared in this scope
     MPM.addPass(PrintModulePass(errs()));
                 ^~~~~~~~~~~~~~~
  ...

The error is due to the llvm patch https://reviews.llvm.org/D138081.
Fix the issue by adjust corresponding header file locaiton
as in the above llvm patch.

Signed-off-by: Yonghong Song <yhs@fb.com>