8020123: Test gc/g1/TestPrintRegionRememberedSetInfo.java fails with "test result: Error. No action after @build"
Summary: Remove the @build tag and replace it by a @run tag so that the test gets executed
Reviewed-by: brutisso, mgerdin

Summary: Improve the output of G1PrintRegionLivenessInfo by adding a per-region remembered set size information column
Reviewed-by: jwilhelm, johnc