expose 64 bit addresses through MI

Summary:
This changes all reporting of addresses from lldb-mi to be 64 bit capable. There could have been cases where a 64 bit address was getting truncated to 32 bit format.

Patch from chuckr@microsoft.com

Reviewers: abidh, ChuckR

Reviewed By: abidh

Subscribers: paulmaybee, ki.stfu, zturner, lldb-commits

Differential Revision: http://reviews.llvm.org/D8238

llvm-svn: 232736