Object model changes to support 64bit.

Modify mirror objects so that references between them use an ObjectReference
value type rather than an Object* so that functionality to compress larger
references can be captured in the ObjectRefererence implementation.
ObjectReferences are 32bit and all other aspects of object layout remain as
they are currently.

Expand fields in objects holding pointers so they can hold 64bit pointers. Its
expected the size of these will come down by improving where we hold compiler
meta-data.
Stub out x86_64 architecture specific runtime implementation.
Modify OutputStream so that reads and writes are of unsigned quantities.
Make the use of portable or quick code more explicit.
Templatize AtomicInteger to support more than just int32_t as a type.
Add missing, and fix issues relating to, missing annotalysis information on the
mutator lock.
Refactor and share implementations for array copy between System and uses
elsewhere in the runtime.
Fix numerous 64bit build issues.

Change-Id: I1a5694c251a42c9eff71084dfdd4b51fff716822
diff --git a/runtime/dex_file.h b/runtime/dex_file.h
index bc2bfde..46df455 100644
--- a/runtime/dex_file.h
+++ b/runtime/dex_file.h
@@ -794,7 +794,7 @@
   // Returns -2 for native methods (as expected in exception traces).
   //
   // This is used by runtime; therefore use art::Method not art::DexFile::Method.
-  int32_t GetLineNumFromPC(const mirror::ArtMethod* method, uint32_t rel_pc) const
+  int32_t GetLineNumFromPC(mirror::ArtMethod* method, uint32_t rel_pc) const
       SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
 
   void DecodeDebugInfo(const CodeItem* code_item, bool is_static, uint32_t method_idx,