Avoid unintentional optimization of hot builtins by TurboFan.

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 759 matching lines @@
 }
 
 
 Handle<Code> Pipeline::GenerateCode() {
   // TODO(turbofan): Make OSR work with inner loops and remove this bailout.
   if (info()->is_osr() && !FLAG_turbo_osr) return Handle<Code>::null();
 
   // TODO(mstarzinger): This is just a temporary hack to make TurboFan work,
   // the correct solution is to restore the context register after invoking
   // builtins from full-codegen.
-  if (isolate()->bootstrapper()->IsActive()) return Handle<Code>::null();
+  Handle<SharedFunctionInfo> shared = info()->shared_info();
+  if (isolate()->bootstrapper()->IsActive() ||
+      shared->disable_optimization_reason() ==
+          kBuiltinFunctionCannotBeOptimized) {
+    shared->DisableOptimization(kBuiltinFunctionCannotBeOptimized);
+    return Handle<Code>::null();
+  }
 
   ZonePool zone_pool(isolate());
   SmartPointer<PipelineStatistics> pipeline_statistics;
 
   if (FLAG_turbo_stats) {
     pipeline_statistics.Reset(new PipelineStatistics(info(), &zone_pool));
     pipeline_statistics->BeginPhaseKind("initializing");
   }
 
   PipelineData data(&zone_pool, info());
@@ skipping 313 matching lines @@
 }
 
 
 void Pipeline::TearDown() {
   InstructionOperand::TearDownCaches();
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8