Rewrote FieldPack::createFieldPack for alignment

b/20032217

Some data types requires data alignment. This has an impact on the
total data size for the FieldPack. Fixed createFiledPack()
implementation to handle this correctly.

Change-Id: I241da19df69bf51cfdaf3b3a1381b446eaacb7fb

rs/java/android/renderscript/ScriptGroup2.java

@@ -112,7 +112,7 @@ public class ScriptGroup2 extends BaseObj {
         public Closure(RenderScript rs, Script.InvokeID invokeID,
                        Object[] args, Map<Script.FieldID, Object> globals) {
             super(0, rs);
-            mFP = FieldPacker.createFieldPack(args);
+            mFP = FieldPacker.createFromArray(args);
 
             mArgs = args;
             mBindings = globals;