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 5b363e28772436c683ce8eba950e94ddb85163aa..b9f1e3e467a2a73eaed761d38a710ca19f0b9b62 100644
--- a/runtime/vm/object.h
+++ b/runtime/vm/object.h
@@ -4137,6 +4137,9 @@ 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;
 
@@ -4264,6 +4267,9 @@ class Type : public AbstractType {
   // The 'Float32x4' type.
   static RawType* Float32x4();
 
+  // The 'Float64x2' type.
+  static RawType* Float64x2();
+
   // The 'Int32x4' type.
   static RawType* Int32x4();