Properly disable ES6 generator support for TurboFan.

src/runtime.cc

 // Copyright 2012 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 <stdlib.h>
 #include <limits>
 
 #include "src/v8.h"
 
 #include "src/accessors.h"
@@ skipping 15250 matching lines @@
 
 // TODO(mstarzinger): These are place-holder stubs for TurboFan and will
 // eventually all have a C++ implementation and this macro will be gone.
 #define U(name)                               \
   RUNTIME_FUNCTION(RuntimeReference_##name) { \
     UNIMPLEMENTED();                          \
     return NULL;                              \
   }
 
 U(IsStringWrapperSafeForDefaultValueOf)
-U(GeneratorNext)
-U(GeneratorThrow)
 U(DebugBreakInOptimizedCode)
 
 #undef U
 
 
 RUNTIME_FUNCTION(RuntimeReference_IsSmi) {
   SealHandleScope shs(isolate);
   DCHECK(args.length() == 1);
   CONVERT_ARG_CHECKED(Object, obj, 0);
   return isolate->heap()->ToBoolean(obj->IsSmi());
@@ skipping 210 matching lines @@
 }
 
 
 RUNTIME_FUNCTION(RuntimeReference_FastAsciiArrayJoin) {
   SealHandleScope shs(isolate);
   DCHECK(args.length() == 2);
   return isolate->heap()->undefined_value();
 }
 
 
+RUNTIME_FUNCTION(RuntimeReference_GeneratorNext) {
+  UNREACHABLE();  // Optimization disabled in SetUpGenerators().
+  return NULL;
+}
+
+
+RUNTIME_FUNCTION(RuntimeReference_GeneratorThrow) {
+  UNREACHABLE();  // Optimization disabled in SetUpGenerators().
+  return NULL;
+}
+
+
 RUNTIME_FUNCTION(RuntimeReference_ClassOf) {
   SealHandleScope shs(isolate);
   DCHECK(args.length() == 1);
   CONVERT_ARG_CHECKED(Object, obj, 0);
   if (!obj->IsJSReceiver()) return isolate->heap()->null_value();
   return JSReceiver::cast(obj)->class_name();
 }
 
 
 RUNTIME_FUNCTION(RuntimeReference_StringCharCodeAt) {
@@ skipping 134 matching lines @@
   }
   return NULL;
 }
 
 
 const Runtime::Function* Runtime::FunctionForId(Runtime::FunctionId id) {
   return &(kIntrinsicFunctions[static_cast<int>(id)]);
 }
 
 } }  // namespace v8::internal