Implement Function.prototype.toMethod.

src/runtime.cc

Index: src/runtime.cc
diff --git a/src/runtime.cc b/src/runtime.cc
index 97a52710a5c82cf8a0931ef612d3befb141088e3..d7fcfcdb704f972935f741829a4f71efef089d61 100644
--- a/src/runtime.cc
+++ b/src/runtime.cc
@@ -2050,6 +2050,27 @@ RUNTIME_FUNCTION(Runtime_PreventExtensions) {
 }
 
 
+RUNTIME_FUNCTION(Runtime_ToMethod) {
+  HandleScope scope(isolate);
+  DCHECK(args.length() == 2);
+  CONVERT_ARG_HANDLE_CHECKED(JSFunction, fun, 0);
+  CONVERT_ARG_HANDLE_CHECKED(JSObject, home_object, 1);
+  Handle<JSFunction> clone(Handle<JSFunction>::cast(
+        isolate->factory()->CopyJSObject(fun)));
+  Handle<Symbol> home_object_symbol(isolate->heap()->home_object_symbol());
+  RETURN_FAILURE_ON_EXCEPTION(
+      isolate,
+      Object::SetProperty(clone, home_object_symbol, home_object, STRICT));
+  return *clone;
+}
+
+
+RUNTIME_FUNCTION(Runtime_HomeObjectSymbol) {
+  DCHECK(args.length() == 0);
+  return isolate->heap()->home_object_symbol();
+}
+
+
 RUNTIME_FUNCTION(Runtime_IsExtensible) {
   SealHandleScope shs(isolate);
   DCHECK(args.length() == 1);