8141637: Parallelize single threaded heap region iteration during Pre Evacuate Collection Set Reviewed-by: tschatzl, lkorinth

8234897: 8234748: Clean up atomic and orderAccess includes - part 2 Reviewed-by: tschatzl, dholmes

8220376: C2: Int >0 not recognized as !=0 for div by 0 check Reviewed-by: neliasso, vlivanov, mdoerr

8234748: Clean up atomic and orderAccess includes Reviewed-by: dholmes

Merge

8233301: Implementation of JEP 366: Deprecate the ParallelScavenge + SerialOld GC Combination Summary: Deprecate the ParallelScavenge + SerialOld GC combinations by deprecating the UseParallelOldGC flag. Also reviewed by Bernd Eckenfels<ecki@zusammenkunft.net>. Reviewed-by: pliden

8234525: enable link-time section-gc for linux s390x to remove unused code Reviewed-by: erikj, mdoerr

8234809: set relro in linker flags when building with gcc Reviewed-by: erikj, fweimer

8231826: Implement javac changes for pattern matching for instanceof Reviewed-by: mcimadamore Contributed-by: brian.goetz@oracle.com, gavin.bierman@oracle.com, maurizio.cimadamore@oracle.com, srikanth.adayapalam@oracle.com, vicente.romero@oracle.com, jan.lahoda@oracle.com

8230765: Implement nmethod barrier for x86_32 platforms Reviewed-by: rkennke, eosterlund

8233500: Shenandoah: Shenandoah load barrier should save registers before calling keep alive barrier on x86 Reviewed-by: rkennke

8234539: ArchiveRelocationTest.java failed: Archive mapping should always succeed Reviewed-by: ccheung

8234535: Cross compilation fails due to missing CFLAGS for the BUILD_CC Reviewed-by: erikj

8234610: MaxVectorSize set wrongly when UseAVX=3 is specified after JDK-8221092 Reviewed-by: kvn, vlivanov

Merge