8156032: Clean up parallel GC specific code from vm/gc/shared/preservedMarks.cpp
Reviewed-by: stefank, tschatzl

8151556: Use the PreservedMarks* classes for the G1 preserved mark stacks
Reviewed-by: tschatzl

8154153: PS: Restore preserved marks in parallel
Summary: Restore preserved marks after evacuation failure in parallel using the PreservedMark infrastructure.
Reviewed-by: tschatzl

8152312: ParNew: Restore preserved marks in parallel
Reviewed-by: tschatzl

8146991: Introduce per-worker preserved mark stacks in ParallelGC
Reviewed-by: tschatzl, ysr

8146989: Introduce per-worker preserved mark stacks in ParNew
Summary: Unify and provide per-worker preserved mark stack handling in ParNew
Reviewed-by: tschatzl, ysr