RFR: 8339131: Remove rarely-used accessor methods from Opcode

Fri Aug 30 11:53:17 UTC 2024

On Wed, 28 Aug 2024 22:41:59 GMT, Chen Liang <liach at openjdk.org> wrote:

> In offline discussion, we agreed that current fields of `Opcode` violate data oriented design to a large extent. The attributes not generic to all opcode are removed.
> 
> Up for preliminary review; needs to be reworked for #20737.

Looks good to me. 
I'm surprised by the minimal impact of the removal.

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Marked as reviewed by asotona (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/20757#pullrequestreview-2272049037