Use assembly instead of C array literals to link the core snapshot into the VM.

runtime/vm/clustered_snapshot.cc

 // Copyright (c) 2016, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "vm/clustered_snapshot.h"
 
 #include "platform/assert.h"
 #include "vm/bootstrap.h"
 #include "vm/class_finalizer.h"
 #include "vm/dart.h"
@@ skipping 4940 matching lines @@
       heap_(thread->isolate()->heap()),
       zone_(thread->zone()),
       kind_(kind),
       stream_(buffer, size),
       image_reader_(NULL),
       refs_(NULL),
       next_ref_index_(1),
       clusters_(NULL) {
   if (Snapshot::IncludesCode(kind)) {
     ASSERT(instructions_buffer != NULL);
-  }
-  if (instructions_buffer != NULL) {
+    ASSERT(data_buffer != NULL);
     image_reader_ = new (zone_) ImageReader(instructions_buffer, data_buffer);
   }
 }
 
 
 Deserializer::~Deserializer() {
   delete[] clusters_;
 }
 
 
@@ skipping 662 matching lines @@
     thread_->isolate()->SetupImagePage(data_buffer_,
                                        /* is_executable */ false);
   }
 
   deserializer.ReadIsolateSnapshot(thread_->isolate()->object_store());
 
   return ApiError::null();
 }
 
 }  // namespace dart