RFR: 8365501: Remove special AdapterHandlerEntry for abstract methods [v3]

[Vladimir Kozlov]

On Wed, 27 Aug 2025 19:35:04 GMT, Ashutosh Mehra <asmehra at openjdk.org> wrote:

>> This PR removes the need for having AdapterHandlerEntry for abstract methods. The check for abstract method is now done in the accessor functions in Method such as Method::get_i2c_entry().
>> Motivation for this change is described in the JBS issue.
>
> Ashutosh Mehra has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Address review comment - swap conditions
>   
>   Signed-off-by: Ashutosh Mehra <asmehra at redhat.com>

@adinn, please review these changes.

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PR Comment: https://git.openjdk.org/jdk/pull/26764#issuecomment-3238440040