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

8234394: C2: Dynamic register class support in ADLC Reviewed-by: vlivanov, sviswanathan, thartmann, kvn

8234387: C2: Better support of operands with multiple match rules in AD files Reviewed-by: vlivanov, sviswanathan, thartmann, dlong

8234403: C2: Enable CallSite.target updates in constructors Reviewed-by: psandoz, kvn

8234401: ConstantCallSite may stuck in non-frozen state Reviewed-by: psandoz

8233870: JFR TestSetEndTime.java times out - onClose() is never called Reviewed-by: mgronlun

8234613: JavaThread can escape back to Java from an ongoing handshake Summary: Check again if we have a pending/in-progress handshake operation after executing ~ThreadInVMForHandshake() Reviewed-by: coleenp, dcubed, dholmes, rehn

Metadatatype back to metaspace.hpp to reduce patch size

Improve BLA and LOM tests

8234768: Shenandoah: Streamline enqueueing runtime barriers Reviewed-by: zgu

8234270: [REDO] JDK-8204128 NMT might report incorrect numbers for Compiler area Reviewed-by: stuefe, minqi

8234798: Build failure after atomic changes in JDK-8234563 Reviewed-by: tschatzl, rkennke, zgu

8234619: ZGC: gc/z/TestSmallHeap.java failure with Out Of Memory Reviewed-by: tschatzl, eosterlund

Merge

8234729: Javac should eagerly change code generation for method references to avert IllegalAccessError in future. Reviewed-by: mcimadamore

8221372: Test vmTestbase/nsk/jvmti/GetThreadState/thrstat001/TestDescription.java times out Summary: Update test to get rid of unneeded MethodEntry/MethodExit events Reviewed-by: amenkov, cjplummer

8179320: File.getUsableSpace() returns a negative number on very large file system Reviewed-by: alanb, rriggs, darcy

8234681: Remove UseJVMCIClassLoader logic from JVMCI code Reviewed-by: kvn, iignatyev

8234684: JFR crashes when rotating the JFR output during assertion failure Reviewed-by: egahlin, mseledtsov

8234359: [JVMCI] invalidate_nmethod_mirror shouldn't use a phantom reference Reviewed-by: kvn, eosterlund

8233197: Invert JvmtiExport::post_vm_initialized() and Jfr:on_vm_start() start-up order for correct option parsing Reviewed-by: sspitsyn, egahlin

8234531: Remove CMS code from CLDG and safepoint cleanup Reviewed-by: coleenp, zgu

Improve comments

Merge

8234602: ZGC: Windows compile error in ZHeuristic Reviewed-by: pliden, eosterlund

8234009: ZGC: Move resurrection unblock to before the _unload.purge() call Reviewed-by: pliden, eosterlund

8234010: ZGC: Change ZResurrection to use Atomic::load/store Reviewed-by: pliden, eosterlund

8234740: Harmonize parameter order in Atomic - cmpxchg Reviewed-by: rehn, dholmes

8234739: Harmonize parameter order in Atomic - xchg Reviewed-by: rehn, dholmes

8234738: Harmonize parameter order in Atomic - sub Reviewed-by: rehn, dholmes

8234737: Harmonize parameter order in Atomic - add Reviewed-by: rehn, dholmes

8234736: Harmonize parameter order in Atomic - store Reviewed-by: rehn, dholmes

8234562: Move OrderAccess::release_store*/load_acquire to Atomic Reviewed-by: rehn, dholmes

8234703: JFR TestOutOfProcessMigration.java should clean up files Reviewed-by: mgronlun

8234573: ZGC: Enable ZVerifyMarking by default in debug builds Reviewed-by: stefank, tschatzl

8234433: TestUnloadEventClassCount fails with "assert(SafepointSynchronize::is_at_safepoint()) failed: invariant" Reviewed-by: pliden

8234629: remove unused functions from libnet Reviewed-by: alanb, vtewari

8234509: Race in macOS os::processor_id() Reviewed-by: dholmes, pliden, rehn

8233029: Obsolete flag GCTaskTimeStampEntries Reviewed-by: kbarrett, tschatzl