[turbofan] Properly optimize instanceof (even in the presence of @@hasInstance).

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 98bce48f3abe05a8232d93c6d116a512c9511165..93c43ab5db4113bca167d1e69da47742a8d8a9f8 100644
--- a/src/builtins/builtins-object.cc
+++ b/src/builtins/builtins-object.cc
@@ -1060,5 +1060,19 @@ void Builtins::Generate_InstanceOf(compiler::CodeAssemblerState* state) {
   assembler.Return(assembler.InstanceOf(object, callable, context));
 }
 
+// ES6 section 7.3.19 OrdinaryHasInstance ( C, O )
+void Builtins::Generate_OrdinaryHasInstance(
+    compiler::CodeAssemblerState* state) {
+  typedef compiler::Node Node;
+  typedef CompareDescriptor Descriptor;
+  CodeStubAssembler assembler(state);
+
+  Node* constructor = assembler.Parameter(Descriptor::kLeft);
+  Node* object = assembler.Parameter(Descriptor::kRight);
+  Node* context = assembler.Parameter(Descriptor::kContext);
+
+  assembler.Return(assembler.OrdinaryHasInstance(context, constructor, object));
+}
+
 }  // namespace internal
 }  // namespace v8