[es6] Perform the IsConstructor test in GetSuperConstructor.

src/interpreter/bytecode-generator.cc

Index: src/interpreter/bytecode-generator.cc
diff --git a/src/interpreter/bytecode-generator.cc b/src/interpreter/bytecode-generator.cc
index 141d9ed3b68f3b2db05ec14c978d8ddaf50e11f1..74bdb7ebf4d4a778a2f4ba587f2528d565190b6a 100644
--- a/src/interpreter/bytecode-generator.cc
+++ b/src/interpreter/bytecode-generator.cc
@@ -2513,11 +2513,9 @@ void BytecodeGenerator::VisitCallSuper(Call* expr) {
   SuperCallReference* super = expr->expression()->AsSuperCallReference();
 
   // Prepare the constructor to the super call.
-  Register this_function = VisitForRegisterValue(super->this_function_var());
-  builder()->CallRuntime(Runtime::kInlineGetSuperConstructor, this_function);
-
-  Register constructor = this_function;  // Re-use dead this_function register.
-  builder()->StoreAccumulatorInRegister(constructor);
+  VisitForAccumulatorValue(super->this_function_var());
+  Register constructor = register_allocator()->NewRegister();
+  builder()->GetSuperConstructor(constructor);
 
   ZoneList<Expression*>* args = expr->arguments();