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/oat_file.h b/runtime/oat_file.h
index 887a9d1..d6e8dc0 100644
--- a/runtime/oat_file.h
+++ b/runtime/oat_file.h
@@ -97,8 +97,30 @@
       return native_gc_map_offset_;
     }
 
-    const void* GetCode() const;
-    uint32_t GetCodeSize() const;
+    const void* GetPortableCode() const {
+      // TODO: encode whether code is portable/quick in flags within OatMethod.
+      if (kUsePortableCompiler) {
+        return GetOatPointer<const void*>(code_offset_);
+      } else {
+        return nullptr;
+      }
+    }
+
+    const void* GetQuickCode() const {
+      if (kUsePortableCompiler) {
+        return nullptr;
+      } else {
+        return GetOatPointer<const void*>(code_offset_);
+      }
+    }
+
+    uint32_t GetPortableCodeSize() const {
+      // TODO: With Quick, we store the size before the code. With Portable, the code is in a .o
+      // file we don't manage ourselves. ELF symbols do have a concept of size, so we could capture
+      // that and store it somewhere, such as the OatMethod.
+      return 0;
+    }
+    uint32_t GetQuickCodeSize() const;
 
     const uint8_t* GetMappingTable() const {
       return GetOatPointer<const uint8_t*>(mapping_table_offset_);