Reland Migrate Object.prototype.valueOf to CSA

src/builtins/builtins-object.cc

Index: src/builtins/builtins-object.cc
diff --git a/src/builtins/builtins-object.cc b/src/builtins/builtins-object.cc
index af5a42aa64e4e79781226d545d8ed20c630e58c4..668a54b50cb1dba4e25cec9b6f49df5d074bc218 100644
--- a/src/builtins/builtins-object.cc
+++ b/src/builtins/builtins-object.cc
@@ -310,6 +310,17 @@ TF_BUILTIN(ObjectProtoToString, ObjectBuiltinsAssembler) {
   }
 }
 
+// ES6 19.3.7 Object.prototype.valueOf
+TF_BUILTIN(ObjectPrototypeValueOf, CodeStubAssembler) {
+  Node* receiver = Parameter(0);
+  Node* context = Parameter(3);
+
+  Callable to_object = CodeFactory::ToObject(isolate());
+  receiver = CallStub(to_object, context, receiver);
+
+  Return(receiver);
+}
+
 TF_BUILTIN(ObjectCreate, ObjectBuiltinsAssembler) {
   Node* prototype = Parameter(1);
   Node* properties = Parameter(2);