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which have multiple VMOption specifications in them run in parallel with the same snapshot filename and they clobber each other resulting in random crashes - Delete the temporary snapshot generation directory after the test run - Modify map_literal_oom_test.dart to run with 10mb heap limit instead of 7MB as the VM service isolate in the dart_no_snapshot run gets an OOM. R=johnmccutchan@google.com, rmacnak@google.com Review URL: https://codereview.chromium.org/1731023003 .