7199923: NPG: tools/javac/T7093325.java timeout Reviewed-by: stefank, coleenp, kvn

7190666: G1: assert(_unused == 0) failed: Inconsistency in PLAB stats Summary: Reset the fields in ParGCAllocBuffer, that are used for accumulating values for the ResizePLAB sensors in PLABStats, to zero after flushing the values to the PLABStats fields. Flush PLABStats values only when retiring the final allocation buffers prior to disposing of a G1ParScanThreadState object, rather than when retiring every allocation buffer. Reviewed-by: jwilhelm, jmasa, ysr

7193946: Move warnings associated with UseMemSetInBOT flag Summary: The warnings associated with the UseMemSetInBOT flag are duplicated in CMS and G1. The separate warnings have been removed and single instance of the warning has been placed in a common location. Reviewed-by: brutisso, ysr

7016955: G1: remove the is_zeroed parameter from the HeapRegion constructor Summary: The is_zeroed parameter is no longer used and so can be removed. Reviewed-by: johnc, jmasa, brutisso Contributed-by: Brandon Mitchell <brandon@twitter.com>

7197557: NPG: nsk/sysdict/vm/stress/chain/chain004 hangs intermittently Reviewed-by: johnc, ysr

7198130: G1: PrintReferenceGC output comes out of order Summary: Move the first part of the GC logging, including timestamp, to the start of the GC Reviewed-by: johnc, jwilhelm

7197269: NPG: FollowReferences has no ClassLoader -> Class link to follow Summary: restore java/lang/ClassLoader.addClass() upcall Reviewed-by: sspitsyn, dcubed, jmasa

7197906: BlockOffsetArray::power_to_cards_back() needs to handle > 32 bit shifts Reviewed-by: brutisso, johnc, ysr Contributed-by: Hal Mo <kungu.mjh@taobao.com>

7198641: new hotspot build - hs25-b02 Reviewed-by: jcoomes

Added tag hs25-b01 for changeset ab29bec425bb