Shrink the inital size of the message snapshot ref table to fit in the initial zone chunk.

runtime/vm/snapshot.cc

 // Copyright (c) 2012, 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/snapshot.h"
 
 #include "platform/assert.h"
 #include "vm/bootstrap.h"
 #include "vm/class_finalizer.h"
 #include "vm/dart.h"
@@ skipping 11 matching lines @@
 #include "vm/timeline.h"
 #include "vm/version.h"
 
 // We currently only expect the Dart mutator to read snapshots.
 #define ASSERT_NO_SAFEPOINT_SCOPE()                                            \
   isolate()->AssertCurrentThreadIsMutator();                                   \
   ASSERT(thread()->no_safepoint_scope_depth() != 0)
 
 namespace dart {
 
-static const int kNumInitialReferences = 64;
+static const int kNumInitialReferences = 32;
 
 
 static bool IsSingletonClassId(intptr_t class_id) {
   // Check if this is a singleton object class which is shared by all isolates.
   return ((class_id >= kClassCid && class_id <= kUnwindErrorCid) ||
           (class_id >= kNullCid && class_id <= kVoidCid));
 }
 
 
 static bool IsObjectStoreClassId(intptr_t class_id) {
@@ skipping 2008 matching lines @@
       *buffer_len_ = BytesWritten();
     }
   } else {
     FreeBuffer();
     ThrowException(exception_type(), exception_msg());
   }
 }
 
 
 }  // namespace dart