RFR: 8353593: MethodData "mileage_*" methods and fields aren't used and can be removed

Thu Apr 3 00:57:19 UTC 2025

Please review this trivial patch to remove dead code from MethodData class.
Tested on Linux x86_64 with JTREG_TIER1.

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Commit messages:
 - Mileage fields & methods aren't used anymore.

Changes: https://git.openjdk.org/jdk/pull/24399/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=24399&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8353593
  Stats: 15 lines in 2 files changed: 0 ins; 13 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/24399.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/24399/head:pull/24399

PR: https://git.openjdk.org/jdk/pull/24399