[es6] Perform the IsConstructor test in GetSuperConstructor.

src/compiler/typer.cc

Index: src/compiler/typer.cc
diff --git a/src/compiler/typer.cc b/src/compiler/typer.cc
index ff5c3a10ce676a0f9fb32d0bffcadd8f817d5014..c9db5fd99744fddd87ca85541777c341246814df 100644
--- a/src/compiler/typer.cc
+++ b/src/compiler/typer.cc
@@ -1209,6 +1209,10 @@ Type* Typer::Visitor::TypeJSHasProperty(Node* node) { return Type::Boolean(); }
 
 Type* Typer::Visitor::TypeJSInstanceOf(Node* node) { return Type::Boolean(); }
 
+Type* Typer::Visitor::TypeJSGetSuperConstructor(Node* node) {
+  return Type::Function();

[Benedikt Meurer, 2016/11/23 04:51:00]

This is probably not correct, as this can return any value v for which
IsConstructor(v) returns true, i.e. including proxies, bound functions and
special API objects. So the type should probably by Type::Receiver here.

+}
+
 // JS context operators.