Update structs and defines for 64-bit.

Also adds RS_FIND_OFFSETS, which prints address info for various types that allow us to easily update __pad.

Change-Id: I4d57248e155d113c83ff69f4f8f64160aa24fb9b
diff --git a/Android.mk b/Android.mk
index 7ec8109..1357160 100644
--- a/Android.mk
+++ b/Android.mk
@@ -10,6 +10,10 @@
   rs_base_CFLAGS += -DOVERRIDE_RS_DRIVER=$(OVERRIDE_RS_DRIVER)
 endif
 
+ifeq ($(RS_FIND_OFFSETS), true)
+  rs_base_CFLAGS += -DRS_FIND_OFFSETS
+endif
+
 include $(CLEAR_VARS)
 LOCAL_CLANG := true
 LOCAL_MODULE := libRSDriver