RFR: 8294841: G1: Refactor predict_base_elapsed_time_ms

[Thomas Schatzl]

Hi,

  can I have reviews for this change that does some minor renaming?

Testing: local compilation, gha

Thanks,
  Thomas

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Commit messages:
 - initial version

Changes: https://git.openjdk.org/jdk/pull/10644/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=10644&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8294841
  Stats: 24 lines in 3 files changed: 6 ins; 0 del; 18 mod
  Patch: https://git.openjdk.org/jdk/pull/10644.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/10644/head:pull/10644

PR: https://git.openjdk.org/jdk/pull/10644