Avoid unintentional optimization of hot builtins by TurboFan.

src/bootstrapper.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/bootstrapper.h"
 
 #include "src/accessors.h"
 #include "src/code-stubs.h"
 #include "src/extensions/externalize-string-extension.h"
 #include "src/extensions/free-buffer-extension.h"
@@ skipping 2492 matching lines @@
 }
 
 
 bool Genesis::InstallJSBuiltins(Handle<JSBuiltinsObject> builtins) {
   HandleScope scope(isolate());
   for (int i = 0; i < Builtins::NumberOfJavaScriptBuiltins(); i++) {
     Builtins::JavaScript id = static_cast<Builtins::JavaScript>(i);
     Handle<Object> function_object = Object::GetProperty(
         isolate(), builtins, Builtins::GetName(id)).ToHandleChecked();
     Handle<JSFunction> function = Handle<JSFunction>::cast(function_object);
+    // 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.
+    function->shared()->DisableOptimization(kBuiltinFunctionCannotBeOptimized);
     builtins->set_javascript_builtin(id, *function);
     if (!Compiler::EnsureCompiled(function, CLEAR_EXCEPTION)) {
       return false;
     }
     builtins->set_javascript_builtin_code(id, function->shared()->code());
   }
   return true;
 }
 
 
@@ skipping 340 matching lines @@
   return from + sizeof(NestingCounterType);
 }
 
 
 // Called when the top-level V8 mutex is destroyed.
 void Bootstrapper::FreeThreadResources() {
   DCHECK(!IsActive());
 }
 
 } }  // namespace v8::internal