Unbox/Box Float64x2 and inline typed array loads and stores

runtime/vm/deferred_objects.h

Index: runtime/vm/deferred_objects.h
diff --git a/runtime/vm/deferred_objects.h b/runtime/vm/deferred_objects.h
index 809a2ad21b29448a81b4830fff1325ef8c9a55f6..2e0733c4c9a416a015045538e5fc18920aa27639 100644
--- a/runtime/vm/deferred_objects.h
+++ b/runtime/vm/deferred_objects.h
@@ -87,6 +87,23 @@ class DeferredFloat32x4 : public DeferredSlot {
 };
 
 
+class DeferredFloat64x2 : public DeferredSlot {
+ public:
+  DeferredFloat64x2(simd128_value_t value, RawInstance** slot,
+                    DeferredSlot* next)
+      : DeferredSlot(slot, next), value_(value) { }
+
+  virtual void Materialize(DeoptContext* deopt_context);
+
+  simd128_value_t value() const { return value_; }
+
+ private:
+  const simd128_value_t value_;
+
+  DISALLOW_COPY_AND_ASSIGN(DeferredFloat64x2);
+};
+
+
 class DeferredInt32x4 : public DeferredSlot {
  public:
   DeferredInt32x4(simd128_value_t value, RawInstance** slot,