RFR: Upstream merge 2018-06-06

[Roman Kennke]

Another day, another batch of stuff from upstream (I'm catching up. slowly.)

This time up to:
changeset:   50515:d9bc8557ae16
user:        pliden
date:        Fri May 18 15:21:23 2018 +0200
summary:     8202989: Add missing decorators in calls to to
arraycopy_prologue/epilogue

Next one up will be C2 barriers modularization, which I'll take
single-step again. The merge also includes a cherry-pick:

changeset:   50517:3ddd12a7e829
tag:         tip
user:        iignatyev
date:        Fri May 18 12:45:05 2018 -0700
summary:     Cherry-pick: 8203437: 8199370 broke build on linux-ppc64le
(w/ GCC 4.8.5.)


Otherwise I can't run any tests.

Most stuff was trivial. The only thing to watch out for are some
ReferenceProcessor changes which basically eliminates the separate
enqueue phase. We shall have a close look if it possibly breaks stuff.
What I've seen so far looks ok.

Testing: tier3_gc_shenandoah ongoing, but looks ok. must finish clean
before pushing.

http://cr.openjdk.java.net/~rkennke/upstream-merge-2018-06-06/outgoing.txt

Ok?

Roman