[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 7130d5204fd453af6f4b6c0598ddc71f7a67455b..4b367e9323deaa9a4e7d0b7fe17d5c78ccb9c7f8 100644
--- a/src/interpreter/bytecode-generator.cc
+++ b/src/interpreter/bytecode-generator.cc
@@ -2504,11 +2504,9 @@ 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();