Make core snapshot word-size portable again.

runtime/platform/assert.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 "platform/assert.h"
 
 #include "platform/globals.h"
 #include "vm/os.h"
 
 namespace dart {
@@ skipping 16 matching lines @@
 
   // Print the error message into the buffer.
   va_list arguments;
   va_start(arguments, format);
   vsnprintf(buffer + file_and_line_length,
             sizeof(buffer) - file_and_line_length,
             format,
             arguments);
   va_end(arguments);
 
-  // Print the buffer on stderr.
-  fprintf(stderr, "%s\n", buffer);
+  // Print the buffer on stderr and/or syslog.
+  OS::PrintErr("%s\n", buffer);
   fflush(stderr);

[siva, 2016/07/08 16:25:20]

OS::PrintErr does a fflush of the stream, this fflush can be removed.

[rmacnak, 2016/07/08 18:08:58]

Done.

 
   // In case of failed assertions, abort right away. Otherwise, wait
   // until the program is exiting before producing a non-zero exit
   // code through abort.
   // TODO(5411324): replace std::abort with OS::Abort so that we can handle
   // restoring of signal handlers before aborting.
   if (kind_ == ASSERT) {
     OS::Abort();
   }
   static bool failed = false;
   if (!failed) {
     atexit(&failed_exit);
   }
   failed = true;
 }
 
 }  // namespace dart