RFR: 8337269: G1ConfidencePercent interpreted inconsistently

[Thomas Schatzl]

Hi all,

  please review this change that removes the inconsistency in interpretation of G1ConfidencePercent; higher confidence means that G1 should use less safety margin (i.e. part of the variance).

Other than that it does not change the uses for it.

Testing: gha

Thanks,
  Thomas

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Commit messages:
 - 8337269

Changes: https://git.openjdk.org/jdk/pull/21448/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=21448&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8337269
  Stats: 3 lines in 2 files changed: 1 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/21448.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/21448/head:pull/21448

PR: https://git.openjdk.org/jdk/pull/21448