[PATCH] Adding skeleton for unit testing Hexagon Code Emission

[Chad Rosier]

> Looks good and I will submit this for you today.  Chris Lattner can grant
> you check-in permission.

Colin,
For complete information for obtaining commit access, please see the LLVM
Developer Policy:
http://llvm.org/docs/DeveloperPolicy.html#obtaining-commit-access

Generally, the standard is a few solid/substantial commits, prior to being
granted commit-after-approval rights.  Looks like you're well on your way.
:)

 Chad