Unbox/Box Float64x2 and inline typed array loads and stores

runtime/vm/object.h

Index: runtime/vm/object.h
diff --git a/runtime/vm/object.h b/runtime/vm/object.h
index 0e8c586bce49bfc06b211b4af866149fbdf59b63..f98aff2f9e30dc4d3aa9e42118b17ad08580abd6 100644
--- a/runtime/vm/object.h
+++ b/runtime/vm/object.h
@@ -4140,6 +4140,9 @@ class AbstractType : public Instance {
   // Check if this type represents the 'Float32x4' type.
   bool IsFloat32x4Type() const;
 
+  // Check if this type represents the 'Float64x2' type.
+  bool IsFloat64x2Type() const;
+
   // Check if this type represents the 'Int32x4' type.
   bool IsInt32x4Type() const;
 
@@ -4267,6 +4270,9 @@ class Type : public AbstractType {
   // The 'Float32x4' type.
   static RawType* Float32x4();
 
+  // The 'Float64x2' type.
+  static RawType* Float64x2();
+
   // The 'Int32x4' type.
   static RawType* Int32x4();