JDK-6765954 : par compact - stress mode for splitting young gen spaces
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CR 6765745 (par compact - allow young gen spaces to be split) introduces a feature which is not exercised often in normal use. Build a stress mode into debug JVMs to provoke splitting young gen spaces.
Add code to fill unused parts of the young gen and old gen with dummy live objects, and set the dense prefix in the old gen, to provoke splitting a young gen space. The filling must occur during the summary phase of par compaction.