8217922: Compiler dead code removal Reviewed-by: thartmann, neliasso

8215047: Task terminators do not complete termination in consistent state Reviewed-by: tschatzl, minqi

8217785: Padding ParallelTaskTerminator::_offered_termination variable Reviewed-by: shade, tschatzl

8217880: AIX build issue after JDK-8214533 Reviewed-by: goetz, ihse, mbaesken

8217856: ZGC: Break out C2 matching rules into separate AD file Reviewed-by: neliasso, kvn

8217858: ZGC: Clean up ZDriver Reviewed-by: stefank, eosterlund

8217857: ZGC: Move SvcGCMarker to ZServiceabilityTracer Reviewed-by: stefank, eosterlund

8217855: ZGC: Clean up ZReferenceProcessor Reviewed-by: stefank, kbarrett

8217747: ZGC: Minor optimization of ZLoadBarrierStubC1 Reviewed-by: neliasso, eosterlund

8217745: ZGC: Simplify ZLoadBarrierStubC1 Reviewed-by: neliasso, eosterlund

8213229: Investigate treating StringTable as weak in young collections Reviewed-by: zgu, kbarrett

8216987: ciMethodData::load_data() unpacks MDOs with non-atomic copy Reviewed-by: kvn, mdoerr, thartmann

8217777: TEST_BUG: jdk/java/util/prefs/ExportSubtree.java passes even when test should fail Reviewed-by: clanger, rriggs

8217628: Verbose ArrayIndexOutOfBoundsException message also in JNI calls. Reviewed-by: mdoerr, dholmes, lfoltan

8217869: Add count_leading_zeros utility Reviewed-by: neliasso, thartmann

Merge