RFR: 8269295: Verification time before/after young collection only covers parts of the verification

[Thomas Schatzl]

Hi all,

  can I have reviews for this change that makes "Verify Before/After GC" contain all young collection time instead only a (large) part.

This change also removed some unnecessary and unused return values. They can certainly be re-added if necessary.

Testing: tier1

Thanks,
  Thomas

Note: this depends on PR4586.

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Depends on: https://git.openjdk.java.net/jdk/pull/4586

Commit messages:
 - Initial implementation

Changes: https://git.openjdk.java.net/jdk/pull/4587/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=4587&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8269295
  Stats: 28 lines in 3 files changed: 12 ins; 12 del; 4 mod
  Patch: https://git.openjdk.java.net/jdk/pull/4587.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/4587/head:pull/4587

PR: https://git.openjdk.java.net/jdk/pull/4587