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

runtime/bin/fuchsia_test.cc

Index: runtime/bin/fuchsia_test.cc
diff --git a/runtime/bin/fuchsia_test.cc b/runtime/bin/fuchsia_test.cc
index 802ff31fabaa8c5628ab8a483900e7a57b271489..bbf0ad1a66c35b6cecd013faf1d6bcee966d627f 100644
--- a/runtime/bin/fuchsia_test.cc
+++ b/runtime/bin/fuchsia_test.cc
@@ -33,6 +33,17 @@ int main(void) {
     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;