[gardening] Skip vm/dart/use_macho_reduce_padding_flag_test on reload/rollback tests

Change-Id: If9f86d0d5466ae6149ae522b3e09cf577d3f2972
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/465060
Reviewed-by: Daco Harkes <[email protected]>
Commit-Queue: Martin Kustermann <[email protected]>

Author: mkustermann

runtime/tests/vm/vm.status

@@ -334,6 +334,7 @@ dart/regress_48196_test: SkipSlow
 dart/regress_52703_test: SkipSlow
 dart/use_dwarf_stack_traces_flag_deferred_test: SkipSlow
 dart/use_dwarf_stack_traces_flag_test: SkipSlow
+dart/use_macho_reduce_padding_flag_test: SkipSlow
 
 [ $compiler == dartkp && $simulator ]
 dart/awaiter_stacks/stream_methods_test/1: Pass, Slow