Remove more pieces of setRoot.  Add pointer to allocation lookup for scripts.

Change-Id: I2c3075d2056f02bb834bfad403dc72da991f3156
diff --git a/rsScriptC.h b/rsScriptC.h
index c23fb73..3cb9a0b 100644
--- a/rsScriptC.h
+++ b/rsScriptC.h
@@ -52,6 +52,8 @@
 
     BCCscript*    mBccScript;
 
+    const Allocation *ptrToAllocation(const void *) const;
+
     virtual void setupScript();
     virtual uint32_t run(Context *, uint32_t launchID);
 };