Always zero-initialize array used for mapping VM symbols to Dart_CObject

runtime/vm/dart_api_message.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/dart_api_message.h"
 #include "vm/object.h"
 #include "vm/snapshot_ids.h"
 #include "vm/symbols.h"
 #include "vm/unicode.h"
 
@@ skipping 209 matching lines @@
     Dart_CObject* object;
     if (vm_symbol_references_ != NULL &&
         (object = vm_symbol_references_[symbol_id]) != NULL) {
       return object;
     }
 
     if (vm_symbol_references_ == NULL) {
       intptr_t size = sizeof(*vm_symbol_references_) * Symbols::kMaxId;
       vm_symbol_references_ =
           reinterpret_cast<Dart_CObject**>(alloc_(NULL, 0, size));
-#ifdef DEBUG
       memset(vm_symbol_references_, 0, size);
-#endif
     }
 
     RawOneByteString* str =
         reinterpret_cast<RawOneByteString*>(Symbols::GetVMSymbol(object_id));
     intptr_t len = Smi::Value(str->ptr()->length_);
     object = AllocateDartCObjectString(len);
     char* p = object->value.as_string;
     memmove(p, str->ptr()->data_, len);
     p[len] = '\0';
     ASSERT(vm_symbol_references_[symbol_id] == NULL);
@@ skipping 641 matching lines @@
     if (!success) {
       UnmarkAllCObjects(object);
       return false;
     }
   }
   UnmarkAllCObjects(object);
   return true;
 }
 
 }  // namespace dart