RFR (round 4), JEP-318: Epsilon GC

[Aleksey Shipilev]

Hi,

This is fourth (and hopefully final) round of code review for Epsilon GC changes. It includes the
fixes done as the result of third round of reviews, all of them inside gc/epsilon or epsilon tests.

Webrev:
  http://cr.openjdk.java.net/~shade/epsilon/webrev.08/

If we are good, I am going to push this with the following changeset metadata:

  8204180: Implementation: JEP 318: Epsilon A No-Op Garbage Collector
  Summary: Introduce Epsilon GC
  Reviewed-by: rkennke, ihse, pliden, eosterlund, lmesnik

Builds:
    server X {x86_64, x86_32, aarch64, arm32, ppc64le, s390x}
   minimal X {x86, x86_64}
      zero X {x86_64}

Testing: gc/epsilon on x86_64

Thanks,
-Aleksey

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