RFR: Changes to simplify MU accounting

Mon May 8 23:57:40 UTC 2023

This represents a small part of the expand-old-on-demand branch.  By itself, this may result in some performance regression because we no longer use MU (mutator utilization) reports to guide generation sizing decisions.  On the other hand, the guidance provided by MU metrics does not seem to be a very accurate predictor of ideal generation sizes.

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Commit messages:
 - Changes to simplify MU accounting

Changes: https://git.openjdk.org/shenandoah/pull/274/files
 Webrev: https://webrevs.openjdk.org/?repo=shenandoah&pr=274&range=00
  Stats: 203 lines in 7 files changed: 135 ins; 17 del; 51 mod
  Patch: https://git.openjdk.org/shenandoah/pull/274.diff
  Fetch: git fetch https://git.openjdk.org/shenandoah.git pull/274/head:pull/274

PR: https://git.openjdk.org/shenandoah/pull/274