Impelment _Unwind_VRS_{Set|Get} including overlapping VFP data. Remove uneeded DWARF code/warnings.

Moves the VRS functions into the right file and also fixes the libunwind
API to handle returning different data representations to VRS.

Change-Id: I9ab088525d4c014d473fb13ef4245bd7df878d7e
Use EHABI _Unwind_VRS_{Get,Set} instead of Itanium _Unwind_{Get,Set}GR.

Change-Id: Ib0baaf7cff08308f7cce8d8c53747b0e660ad1f9
Remove dead code

Change-Id: Ie5aae1fcd43693bc582beb588bf95e56101c6429
Fix storage location for wMMX registers

Change-Id: I5fb6cc431ebf660e79b80faa73a5bbd691e38ba1
Merge pull request #37 from awong-dev/VRS

Implement _Unwind_VRS_{Set,Get} and Use them.