new classes: implement new.target passing to superclass constructor.

src/compiler/pipeline.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/pipeline.h"
 
 #include <fstream>  // NOLINT(readability/streams)
 #include <sstream>
 
 #include "src/base/platform/elapsed-timer.h"
@@ skipping 792 matching lines @@
   // the correct solution is to restore the context register after invoking
   // builtins from full-codegen.
   Handle<SharedFunctionInfo> shared = info()->shared_info();
   if (isolate()->bootstrapper()->IsActive() ||
       shared->disable_optimization_reason() ==
           kBuiltinFunctionCannotBeOptimized) {
     shared->DisableOptimization(kBuiltinFunctionCannotBeOptimized);
     return Handle<Code>::null();
   }
 
+  // TODO(dslomov): support turbo optimization of subclass constructors.
+  if (IsSubclassConstructor(shared->kind())) {
+    shared->DisableOptimization(kSuperReference);
+    return Handle<Code>::null();
+  }
+
   ZonePool zone_pool;
   SmartPointer<PipelineStatistics> pipeline_statistics;
 
   if (FLAG_turbo_stats) {
     pipeline_statistics.Reset(new PipelineStatistics(info(), &zone_pool));
     pipeline_statistics->BeginPhaseKind("initializing");
   }
 
   if (FLAG_trace_turbo) {
     FILE* json_file = OpenVisualizerLogFile(info(), NULL, "json", "w+");
@@ skipping 347 matching lines @@
 
   if (FLAG_trace_turbo && !data->MayHaveUnverifiableGraph()) {
     TurboCfgFile tcf(data->isolate());
     tcf << AsC1VAllocator("CodeGen", data->register_allocator());
   }
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8