Expand clang-interpreter with example of throwing in and from the JIT for Windows64.

Summary:
Getting this to work is not particularly obvious, and having it as an example should be helpful.
Portions of this could be placed into LLVM, but as a whole it seems necessary to do this a higher level.

Reviewers: lhames, mehdi_amini

Reviewed By: lhames

Subscribers: mgrang, martell, cfe-commits, mgorny

Differential Revision: https://reviews.llvm.org/D35103

llvm-svn: 327528