Fix assertion when creating custom startup snapshots.

src/snapshot-common.cc

 // Copyright 2006-2008 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.
 
 // The common functionality when building with or without snapshots.
 
 #include "src/v8.h"
 
 #include "src/api.h"
 #include "src/base/platform/platform.h"
@@ skipping 137 matching lines @@
 v8::StartupData Snapshot::CreateSnapshotBlob(
     const i::StartupSerializer& startup_ser,
     const i::PartialSerializer& context_ser, Snapshot::Metadata metadata) {
   SnapshotData startup_snapshot(startup_ser);
   SnapshotData context_snapshot(context_ser);
   Vector<const byte> startup_data = startup_snapshot.RawData();
   Vector<const byte> context_data = context_snapshot.RawData();
 
   uint32_t first_page_sizes[kNumPagedSpaces];
 
-  CalculateFirstPageSizes(metadata.embeds_script(), startup_snapshot,
+  CalculateFirstPageSizes(!metadata.embeds_script(), startup_snapshot,
                           context_snapshot, first_page_sizes);
 
   int startup_length = startup_data.length();
   int context_length = context_data.length();
   int context_offset = ContextOffset(startup_length);
 
   int length = context_offset + context_length;
   char* data = new char[length];
 
   memcpy(data + kMetadataOffset, &metadata.RawValue(), kInt32Size);
@@ skipping 30 matching lines @@
   int startup_length;
   memcpy(&startup_length, data->data + kStartupLengthOffset, kIntSize);
   int context_offset = ContextOffset(startup_length);
   const byte* context_data =
       reinterpret_cast<const byte*>(data->data + context_offset);
   DCHECK_LT(context_offset, data->raw_size);
   int context_length = data->raw_size - context_offset;
   return Vector<const byte>(context_data, context_length);
 }
 } }  // namespace v8::internal