ART Runtime: Add movw $xx,yy fault handling

Handle a movw $xx,yy instruction in the segmentation violation fault
handler.  This can be detected by a 0x66 prefix byte for the move
immediate instruction, using this to set the size of the immediate
value.

This test case shows up in 122-npe using my private backend changes.

Change-Id: If224a9dd0084f50c91da418808cbe2d491308600
Category: Device Enablement
Domain: AOSP.ART-Quick
Origin: Internal
Upstream-Candidate: yes
Signed-off-by: Mark Mendell <mark.p.mendell@intel.com>