Fuchsia: Platform specific calls needed to Initialize and Cleanup VM.

runtime/bin/fuchsia_test.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 <stdio.h>
 #include <stdlib.h>
 
 #include <dart_api.h>
 
 int main(void) {
@@ skipping 15 matching lines @@
       NULL,
       NULL,
       NULL,
       NULL);
   if (error != NULL) {
     fprintf(stderr, "VM initialization failed: %s\n", error);
     fflush(stderr);
     free(error);
     return -1;
   }
+
+  fprintf(stderr, "Calling Dart_Cleanup\n");
+  fflush(stderr);

[siva, 2016/07/13 00:27:16]

Would it make sense to replace these fprintf, fflush calls
with Log::PrintErr(...)
we seem to be moving towards that in other places.

[zra, 2016/07/13 16:04:33]

Done.

Hadn't started porting libdart_builtin yet, but log_fuchsia.cc and log_linux.cc
are basically identical so that's easy enough to do.

+  error = Dart_Cleanup();
+  if (error != NULL) {
+    fprintf(stderr, "VM Cleanup failed: %s\n", error);
+    fflush(stderr);
+    free(error);
+    return -1;
+  }
+
   fprintf(stderr, "Success!\n");
   fflush(stderr);
   return 0;
 }