RFR (S) 8224522: Shenandoah should apply barriers on deoptimization

[Aleksey Shipilev]

Bug:
  https://bugs.openjdk.java.net/browse/JDK-8224522

Fix:
  http://cr.openjdk.java.net/~shade/8224522/webrev.01/

Shenandoah, like ZGC, needs to make sure that the oops that are in deoptimized frames are passed
through the barriers. Otherwise deoptimization might sneak bad oops into into Java heap. This is a
very rare, hard to replicate, but still fatal error. The fix copies what ZGC code already does.
Since Shenandoah also runs with compressed oops, we need to take care of "narrowoop" path as well. I
made the oop/narrowoop as close as possible style-wise.

Testing: hotspot_gc_shenandoah; build with -shenandoahgc; jdk-submit (running)

-- 
Thanks,
-Aleksey