RFR: 8354180: Clean up uses of ObjectMonitor caches

[Axel Boldt-Christmas]

On Wed, 9 Apr 2025 12:47:02 GMT, Coleen Phillimore <coleenp at openjdk.org> wrote:

> This is mostly changes from @xmas92 as explained to me plus small cleanup to a read_caches function.
> Tested with tier1-4.

lgtm.

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Marked as reviewed by aboldtch (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/24545#pullrequestreview-2755410213