[RenderScript] Better handle DispatchTable init
1. targetSdkVersion <= deviceAPI, run in native mode when possible
(deviceAPI >= 19);
2. deviceAPI < 19, always use compat mode;
3. targetSdkVersion > deviceAPI, and if 19 < deviceAPI < 21, use compat
mode (since getPointer is not supported before L);
4. targetSdkVersion > deviceAPI >= 21, first try to initialize
DispatchTable based on targetSdkVersion using native mode (libRS.so), if
failed (say if targetSdkVersion = 23, native RS @21, dispatchTable will
not be able to initialized due to the new APIs added), fall back to
compat mode. If native mode successfully loaded, the Incremental
Intrinsic Support can kick in if needed.
Change-Id: Icafe2a1a5512dd15f399341c239dec802442033c
2 files changed
