Reduced memory usage of primitive fields smaller than 4-bytes

Reduced memory used by byte and boolean fields from 4 bytes down to a
single byte and shorts and chars down to two bytes. Fields are now
arranged as Reference followed by decreasing component sizes, with
fields shuffled forward as needed.

Bug: 8135266
Change-Id: I65eaf31ed27e5bd5ba0c7d4606454b720b074752
diff --git a/runtime/mirror/reference-inl.h b/runtime/mirror/reference-inl.h
index b353402..d1d2a3a 100644
--- a/runtime/mirror/reference-inl.h
+++ b/runtime/mirror/reference-inl.h
@@ -24,7 +24,7 @@
 
 inline uint32_t Reference::ClassSize() {
   uint32_t vtable_entries = Object::kVTableLength + 5;
-  return Class::ComputeClassSize(false, vtable_entries, 2, 0, 0);
+  return Class::ComputeClassSize(false, vtable_entries, 2, 0, 0, 0, 0);
 }
 
 inline bool Reference::IsEnqueuable() {