RFR: Update nmethod caching and clean up unused/duplicate methods [v3]

[Ashutosh Mehra]

On Thu, 5 Jun 2025 16:22:08 GMT, Vladimir Kozlov <kvn at openjdk.org> wrote:

>> Ashutosh Mehra has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Remove CodeBuffer::clear_strings() as the relevant destructors clear the
>>   strings
>>   
>>   Signed-off-by: Ashutosh Mehra <asmehra at redhat.com>
>
> And we need to fix bootstrap sequence: [JDK-8358690](https://bugs.openjdk.org/browse/JDK-8358690) and https://github.com/openjdk/leyden/pull/75

@vnkozlov @adinn I have merged premain and the fix for JDK-8358330. Also addressed review comments to remove `AOTCodeEntry::_blob_offset`. GHA is passing now. So I guess its ready for another round of review.

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PR Comment: https://git.openjdk.org/leyden/pull/71#issuecomment-2954509288