[es6] Perform the IsConstructor test in GetSuperConstructor.

src/compiler/typer.cc

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/compiler/typer.h"
 
 #include <iomanip>
 
 #include "src/base/flags.h"
 #include "src/bootstrapper.h"
@@ skipping 1237 matching lines @@
 
 Type* Typer::Visitor::JSInstanceOfTyper(Type* lhs, Type* rhs, Typer* t) {
   return Type::Boolean();
 }
 
 Type* Typer::Visitor::JSOrdinaryHasInstanceTyper(Type* lhs, Type* rhs,
                                                  Typer* t) {
   return Type::Boolean();
 }
 
+Type* Typer::Visitor::TypeJSGetSuperConstructor(Node* node) {
+  return Type::Receiver();

[Benedikt Meurer, 2016/12/12 18:18:19]

You can say Type::Callable() here which I introduced recently, as this will
always return a constructor, and any constructor is callable (we don't have a
notion of callable in the type system, and I don't think it makes sense now, so
go for callable).

+}
+
 // JS context operators.
 
 
 Type* Typer::Visitor::TypeJSLoadContext(Node* node) {
   ContextAccess const& access = ContextAccessOf(node->op());
   switch (access.index()) {
     case Context::PREVIOUS_INDEX:
     case Context::NATIVE_CONTEXT_INDEX:
       return Type::OtherInternal();
     case Context::CLOSURE_INDEX:
@@ skipping 567 matching lines @@
 Type* Typer::Visitor::TypeConstant(Handle<Object> value) {
   if (Type::IsInteger(*value)) {
     return Type::Range(value->Number(), value->Number(), zone());
   }
   return Type::NewConstant(value, zone());
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8