RFR: 8282484: G1: Predicted old time in log always zero

[Thomas Schatzl]

Hi all,

  can I get reviews for this change that fixes log output for the amount of expected time the initial set of old gen regions is going to take?

Previously, due to this error, this value has always been zero.

Testing: local testing, gha

Thanks,
  Thomas

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Commit messages:
 - Initial version

Changes: https://git.openjdk.java.net/jdk/pull/7657/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=7657&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8282484
  Stats: 4 lines in 1 file changed: 0 ins; 1 del; 3 mod
  Patch: https://git.openjdk.java.net/jdk/pull/7657.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/7657/head:pull/7657

PR: https://git.openjdk.java.net/jdk/pull/7657