VectorICs: megamorphic keyed loads in crankshaft don't need a vector.

src/code-factory.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/v8.h"
 
 #include "src/bootstrapper.h"
 #include "src/code-factory.h"
 #include "src/ic/ic.h"
 
@@ skipping 35 matching lines @@
   return Callable(KeyedLoadIC::initialize_stub(isolate),
                   LoadDescriptor(isolate));
 }
 
 
 // static
 Callable CodeFactory::KeyedLoadICInOptimizedCode(
     Isolate* isolate, InlineCacheState initialization_state) {
   auto code = KeyedLoadIC::initialize_stub_in_optimized_code(
       isolate, initialization_state);
-  if (FLAG_vector_ics) {
+  if (FLAG_vector_ics && initialization_state != MEGAMORPHIC) {
     return Callable(code, VectorLoadICDescriptor(isolate));
   }
   return Callable(code, LoadDescriptor(isolate));
 }
 
 
 // static
 Callable CodeFactory::CallIC(Isolate* isolate, int argc,
                              CallICState::CallType call_type) {
   return Callable(CallIC::initialize_stub(isolate, argc, call_type),
@@ skipping 84 matching lines @@
 
 // static
 Callable CodeFactory::CallFunction(Isolate* isolate, int argc,
                                    CallFunctionFlags flags) {
   CallFunctionStub stub(isolate, argc, flags);
   return Callable(stub.GetCode(), stub.GetCallInterfaceDescriptor());
 }
 
 }  // namespace internal
 }  // namespace v8