Turn JSArrayBuffer::flags into a bit field

src/runtime/runtime-typedarray.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/arguments.h"
 #include "src/runtime/runtime.h"
 #include "src/runtime/runtime-utils.h"
 
@@ skipping 24 matching lines @@
 void Runtime::SetupArrayBuffer(Isolate* isolate,
                                Handle<JSArrayBuffer> array_buffer,
                                bool is_external, void* data,
                                size_t allocated_length) {
   DCHECK(array_buffer->GetInternalFieldCount() ==
          v8::ArrayBuffer::kInternalFieldCount);
   for (int i = 0; i < v8::ArrayBuffer::kInternalFieldCount; i++) {
     array_buffer->SetInternalField(i, Smi::FromInt(0));
   }
   array_buffer->set_backing_store(data);
-  array_buffer->set_flag(Smi::FromInt(0));
+  array_buffer->set_bit_field(0);
   array_buffer->set_is_external(is_external);
   array_buffer->set_is_neuterable(true);
 
   Handle<Object> byte_length =
       isolate->factory()->NewNumberFromSize(allocated_length);
   CHECK(byte_length->IsSmi() || byte_length->IsHeapNumber());
   array_buffer->set_byte_length(*byte_length);
 
   if (isolate->heap()->InNewSpace(*array_buffer) ||
       isolate->heap()->array_buffers_list()->IsUndefined()) {
@@ skipping 693 matching lines @@
 DATA_VIEW_SETTER(Uint16, uint16_t)
 DATA_VIEW_SETTER(Int16, int16_t)
 DATA_VIEW_SETTER(Uint32, uint32_t)
 DATA_VIEW_SETTER(Int32, int32_t)
 DATA_VIEW_SETTER(Float32, float)
 DATA_VIEW_SETTER(Float64, double)
 
 #undef DATA_VIEW_SETTER
 }
 }  // namespace v8::internal