7029458: G1: Add newly-reclaimed regions to the beginning of the region free list, not the end Summary: What the synopsis says. Reviewed-by: jwilhelm, iveresov, johnc

7026932: G1: No need to abort VM when card count cache expansion fails Summary: Manage allocation/freeing of the card cache counts and epochs arrays directly so that an allocation failure while attempting to expand these arrays does not abort the JVM. Failure to expand these arrays is not fatal. Reviewed-by: iveresov, tonyp