RFR: Update nmethod caching and clean up unused/duplicate methods

[Ashutosh Mehra]

On Mon, 2 Jun 2025 14:10:41 GMT, Ashutosh Mehra <asmehra at openjdk.org> wrote:

> This PR updates nmethod caching to be based on caching of CodeBlob. It also cleans up some dead code and duplicate methods.

@vnkozlov @adinn please review.

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PR Comment: https://git.openjdk.org/leyden/pull/71#issuecomment-2930929481