Sink an AccessPath helper down to the analysis library
Sink an AccessPath helper down to the analysis library

This one converts abstract access paths to an externalizable format
that can be written out and read back in.  This is necessary because
reading back in Types would be very difficult.

travitch/llvm-analysis,travitch/llvm-analysis,wangxiayang/llvm-analysis,wangxiayang/llvm-analysis