[11] RFR: 2020-04-15, Bulk backports to sh/jdk11

[Aleksey Shipilev]

On 4/16/20 11:43 AM, Roman Kennke wrote:
> Why haven't you included the I-U mode addition?

Because this batch is already quite large and the rest requires fiddling with other arches as well.

Left these out:
  8242316: Shenandoah: Turn NULL-check into assert in SATB slow-path entry
  8242301: Shenandoah: Inline LRB runtime call
  8242273: Shenandoah: accept either SATB or IU barriers, but not both
  8242271: Shenandoah: add test to verify GC mode unlock
  8242054: Shenandoah: New incremental-update mode
  8242217: Shenandoah: Enable GC mode to be diagnostic/experimental and have a name
  8242130: Shenandoah: Simplify arraycopy-barrier dispatching
  8241700: Shenandoah: Fold ShenandoahKeepAliveBarrier flag into ShenandoahSATBBarrier
  8241675: Shenandoah: assert(n->outcnt() > 0) at shenandoahSupport.cpp:2858 with
java/util/Collections/FindSubList.java

-- 
Thanks,
-Aleksey