8176506: C2: loop unswitching and unsafe accesses cause crash Reviewed-by: vlivanov, mcberg, kvn, simonis

8171504: [aix] On AIX, -XXaltjvm=<path> option is ignored Reviewed-by: clanger, mdoerr

8166651: OrderAccess::load_acquire &etc should have const parameters Summary: Added const qualifiers to load/load_acquire source parameters. Reviewed-by: dholmes, coleenp, adinn, eosterlund

8176132: -XX:+PrintSharedSpaces should be converted to use Unified Logging. Summary: Converted -XX:+PrintSharedSpaces to -Xlog:cds=info Reviewed-by: iklam, jiangli, mseledtsov

8179527: Implement intrinsic code for reverseBytes with load/store Reviewed-by: simonis, mdoerr Contributed-by: Michihiro Horie <horie@jp.ibm.com>

8177044: Remove _scan_top from HeapRegion Summary: Remove the _scan_top member from HeapRegion using a per-gc pre-calculated table of scan limits that also subsumes other checks. Reviewed-by: sangheki, kbarrett, ehelin

8177707: Specialize G1RemSet::refine_card for concurrent/during safepoint refinement Reviewed-by: ehelin, kbarrett

8162928: Micro-optimizations in scanning the remembered sets Reviewed-by: ehelin, kbarrett

8071280: Specialize HeapRegion::oops_on_card_seq_iterate_careful() for use during concurrent refinement and updating the rset Reviewed-by: kbarrett, sangheki, ehelin

8181451: JDK-8174231 broke some clang builds Reviewed-by: stuefe, kbarrett, iveresov