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/entrypoints/quick/quick_trampoline_entrypoints.cc b/runtime/entrypoints/quick/quick_trampoline_entrypoints.cc
index b589384..9f30190 100644
--- a/runtime/entrypoints/quick/quick_trampoline_entrypoints.cc
+++ b/runtime/entrypoints/quick/quick_trampoline_entrypoints.cc
@@ -97,6 +97,12 @@
 #define QUICK_CALLEE_SAVE_FRAME__REF_AND_ARGS__LR_OFFSET 28
 #define QUICK_CALLEE_SAVE_FRAME__REF_AND_ARGS__FRAME_SIZE 32
 #define QUICK_STACK_ARG_SKIP 16
+#elif defined(__x86_64__)
+// TODO: implement and check these.
+#define QUICK_CALLEE_SAVE_FRAME__REF_AND_ARGS__R1_OFFSET 8
+#define QUICK_CALLEE_SAVE_FRAME__REF_AND_ARGS__LR_OFFSET 56
+#define QUICK_CALLEE_SAVE_FRAME__REF_AND_ARGS__FRAME_SIZE 64
+#define QUICK_STACK_ARG_SKIP 32
 #else
 #error "Unsupported architecture"
 #define QUICK_CALLEE_SAVE_FRAME__REF_AND_ARGS__R1_OFFSET 0
@@ -567,15 +573,15 @@
     SirtRef<mirror::Class> called_class(soa.Self(), called->GetDeclaringClass());
     linker->EnsureInitialized(called_class, true, true);
     if (LIKELY(called_class->IsInitialized())) {
-      code = called->GetEntryPointFromCompiledCode();
+      code = called->GetEntryPointFromQuickCompiledCode();
     } else if (called_class->IsInitializing()) {
       if (invoke_type == kStatic) {
         // Class is still initializing, go to oat and grab code (trampoline must be left in place
         // until class is initialized to stop races between threads).
-        code = linker->GetOatCodeFor(called);
+        code = linker->GetQuickOatCodeFor(called);
       } else {
         // No trampoline for non-static methods.
-        code = called->GetEntryPointFromCompiledCode();
+        code = called->GetEntryPointFromQuickCompiledCode();
       }
     } else {
       DCHECK(called_class->IsErroneous());