Convert Java/JNI to 64-bit, part 2.

This changes BaseObj to support 64-bit IDs. There are a few caveats:

1. Since it is deprecated, RSG will not support 64-bit.
2. Currently, methods that pass arrays of IDs to the driver are not supported in 64-bit. This will be fixed in a later CL.

bug 11332320

Change-Id: If0dbecc8b285e260f767e441e05088b6a1b749a2
diff --git a/graphics/java/android/renderscript/FieldPacker.java b/graphics/java/android/renderscript/FieldPacker.java
index fed97d6..cf20e63 100644
--- a/graphics/java/android/renderscript/FieldPacker.java
+++ b/graphics/java/android/renderscript/FieldPacker.java
@@ -232,7 +232,8 @@
 
     public void addObj(BaseObj obj) {
         if (obj != null) {
-            addI32(obj.getID(null));
+            // FIXME: this is fine for 32-bit but needs a path for 64-bit
+            addI32((int)obj.getID(null));
         } else {
             addI32(0);
         }