RFR: 8365501: Remove speical AdapterHandlerEntry for abstract methods

[Vladimir Kozlov]

On Wed, 13 Aug 2025 18:45:54 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.

My tier1-5 testing passed

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Marked as reviewed by kvn (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/26764#pullrequestreview-3118132374