RFR (S) 8245478: Implementation: JEP 379: Shenandoah: A Low-Pause-Time Garbage Collector (Production)

[Aleksey Shipilev]

Hi,

JEP:  https://openjdk.java.net/jeps/379
Impl: https://bugs.openjdk.java.net/browse/JDK-8245478
CSR:  https://bugs.openjdk.java.net/browse/JDK-8245479

Webrev:
  https://cr.openjdk.java.net/~shade/8245478/webrev.01/

Along with flag changes, I also enabled back the tests that assume Shenandoah is "product", like we
have in sh/jdk11 and sh/jdk8 trees.

Testing: hotspot_gc_shenandoah

-- 
Thanks,
-Aleksey