8199326: Remove G1 gc time stamp logic Summary: G1 gc time stamp logic is unused completely after JDK-8180415, so removing it. Reviewed-by: sangheki, sjohanss

8197932: Better split work in rebuild remembered sets phase Summary: Let threads rebuilding remembered sets yield after every G1RebuildRemSetChunkSize (default: 256kB) sized memory area to improve TTSP. Reviewed-by: sangheki, sjohanss

8197928: Only enqueue deferred cards with references into regions that have a tracked remembered set during GC Reviewed-by: sangheki, sjohanss

8197573: Remove concurrent cleanup and secondary free list handling Summary: Remove secondary free list and all associated functionality, moving the cleanup work into the Cleanup pause instead. Reviewed-by: sangheki, sjohanss

8200292: Move PushAndMarkVerifyClosure::do_oop_work to concurrentMarkSweepGeneration.cpp Reviewed-by: tschatzl, sjohanss

8199927: Make WhiteBox more GC agnostic Reviewed-by: shade, eosterlund

8199925: Break out GC selection logic from GCArguments to GCConfig Reviewed-by: eosterlund, rkennke

8199918: Shorten names of CollectedHeap::Name members Reviewed-by: shade, eosterlund

8198915: [Graal] 3rd testcase of compiler/types/TestMeetIncompatibleInterfaceArrays.java takes more than 10 mins Reviewed-by: kvn, thartmann

8200245: Zero fails to build on linux-ia64 due to ia64-specific cruft Reviewed-by: dholmes, stuefe