RFR: 8336275: Move common Method and Constructor fields to Executable [v2]

[David Holmes]

On Wed, 17 Jul 2024 03:03:23 GMT, Chen Liang <liach at openjdk.org> wrote:

>> Move fields common to Method and Field to executable, which simplifies implementation. Removed useless transient modifiers as Method and Field were never serializable.
>
> Chen Liang has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Redundant transient; Update the comments to be more accurate

Marked as reviewed by dholmes (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/20188#pullrequestreview-2181897055