[es6] Perform the IsConstructor test in GetSuperConstructor.

src/interpreter/bytecode-generator.cc

 // Copyright 2015 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/interpreter/bytecode-generator.h"
 
 #include "src/ast/compile-time-value.h"
 #include "src/ast/scopes.h"
 #include "src/code-stubs.h"
 #include "src/compilation-info.h"
@@ skipping 2467 matching lines @@
     feedback_slot_index = feedback_index(expr->CallFeedbackICSlot());
   }
   builder()->Call(callee, args, feedback_slot_index, expr->tail_call_mode());
 }
 
 void BytecodeGenerator::VisitCallSuper(Call* expr) {
   RegisterAllocationScope register_scope(this);
   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);
+  VisitForAccumulatorValue(super->this_function_var());
+  builder()->GetSuperConstructor();

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

We should probably pass an output register to this bytecode, because we will
always store the result to some register anyways, so we could save the Star
bytecode. Ross?

[rmcilroy, 2016/11/23 21:55:37]

Yup sounds good, just add a kRegOut operand and pass the register as an operand.

 
-  Register constructor = this_function;  // Re-use dead this_function register.
+  Register constructor = register_allocator()->NewRegister();
   builder()->StoreAccumulatorInRegister(constructor);
 
   RegisterList args =
       register_allocator()->NewRegisterList(expr->arguments()->length());
   VisitArguments(expr->arguments(), args);
 
   // The new target is loaded into the accumulator from the
   // {new.target} variable.
   VisitForAccumulatorValue(super->new_target_var());
 
@@ skipping 685 matching lines @@
 }
 
 Runtime::FunctionId BytecodeGenerator::StoreKeyedToSuperRuntimeId() {
   return is_strict(language_mode()) ? Runtime::kStoreKeyedToSuper_Strict
                                     : Runtime::kStoreKeyedToSuper_Sloppy;
 }
 
 }  // namespace interpreter
 }  // namespace internal
 }  // namespace v8