Compiler kernel fusion for RenderScript.

This was started by Tobias Grosser during his internship at Google in 2013.
This CL includes his original changes and generalization to make it work with
the new proposed ScriptGroup API and made the ImageProcessing processing work
with this.
An enabling CL is needed in the RenderScript runtime, which I will post
seperately.

Change-Id: Ia73ea917a126a5055ec97f13d90a5feaafd6a2f5
10 files changed