RFR: 8358003: KlassTrainingData initializer reads garbage holder [v5]

[Igor Veresov]

> Simplify KlassTrainingData constructor. The lines in question come from the old pre-CDS world. They are not needed anymore.

Igor Veresov has updated the pull request incrementally with one additional commit since the last revision:

  Undo OopStorage changes

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Changes:
  - all: https://git.openjdk.org/jdk/pull/25623/files
  - new: https://git.openjdk.org/jdk/pull/25623/files/5a7b128f..a5693d69

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=25623&range=04
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=25623&range=03-04

  Stats: 33 lines in 5 files changed: 8 ins; 21 del; 4 mod
  Patch: https://git.openjdk.org/jdk/pull/25623.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/25623/head:pull/25623

PR: https://git.openjdk.org/jdk/pull/25623