7102776: Pack instanceKlass boolean fields into single u1 field Summary: Reduce class runtime memory usage by packing 4 instanceKlass boolean fields into single u1 field. Save 4-byte for each loaded class. Reviewed-by: dholmes, bobv, phh, twisti, never, coleenp Contributed-by: Jiangli Zhou <jiangli.zhou@oracle.com>

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