SystemUI: temporary workaround for garbeled screenshot preview

The problem shows some underlying issues View.LAYER_TYPE_HARDWARE
so this is NOT a fix. Just since this issue is so obvious visible
it would save us from a lot of bug reports and questions for now :)

Change-Id: If188aa668c1024e857d931ccef4ad3e99edce348
frameworks/base: vectorize Bitmap operations

Enable gcc vectorizing optimizations for Bitmap operations within
libandroid_runtime.so.  Adds -ftree-vectorize -mvectorize-with-neon-quad
-fprefetch-loop-arrays to functions and compiles Bitmap.cpp in ARM mode
(necessary to enable vectorizing optimizations) for appropriate targets.

Change-Id: If52a789b6f592b137e64e85077665c9ce5957f79

Conflicts:
	core/jni/Android.mk