RFR: 8323627: Shenandoah: Refactor init logger

[Kelvin Nilsen]

On Thu, 11 Jan 2024 23:05:18 GMT, William Kemper <wkemper at openjdk.org> wrote:

> Use format macros and override keyword to improvement readability.

Marked as reviewed by kdnilsen (no project role).

Note the failures in GHA tests.

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PR Review: https://git.openjdk.org/jdk/pull/17383#pullrequestreview-1818333264
PR Comment: https://git.openjdk.org/jdk/pull/17383#issuecomment-1889297431