Extract non-IO part of mksnapshot into an API method.

src/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/factory.h"
 
 #include "src/allocation-site-scopes.h"
 #include "src/base/bits.h"
 #include "src/conversions.h"
 #include "src/isolate-inl.h"
@@ skipping 2138 matching lines @@
                                    Handle<String> string) {
   int hash = NumberCacheHash(number_string_cache(), number);
   if (number_string_cache()->get(hash * 2) != *undefined_value()) {
     int full_size = isolate()->heap()->FullSizeNumberStringCacheLength();
     if (number_string_cache()->length() != full_size) {
       // The first time we have a hash collision, we move to the full sized
       // number string cache.  The idea is to have a small number string
       // cache in the snapshot to keep  boot-time memory usage down.
       // If we expand the number string cache already while creating
       // the snapshot then that didn't work out.
-      DCHECK(!isolate()->serializer_enabled() || FLAG_extra_code != NULL);
+      DCHECK(!isolate()->serializer_enabled());
       Handle<FixedArray> new_cache = NewFixedArray(full_size, TENURED);
       isolate()->heap()->set_number_string_cache(*new_cache);
       return;
     }
   }
   number_string_cache()->set(hash * 2, *number);
   number_string_cache()->set(hash * 2 + 1, *string);
 }
 
 
@@ skipping 351 matching lines @@
   return Handle<Object>::null();
 }
 
 
 Handle<Object> Factory::ToBoolean(bool value) {
   return value ? true_value() : false_value();
 }
 
 
 } }  // namespace v8::internal