RFR: 8339132: Make DirectCodeBuilder write through without allocating instruction objects [v2]

[Claes Redestad]

On Wed, 28 Aug 2024 19:56:53 GMT, Chen Liang <liach at openjdk.org> wrote:

>> Make `DirectCodeBuilder` write instructions actually directly without allocating extra objects. This speed up a lot of simple Class-File building cases that never go through intermediate transforms.
>
> Chen Liang has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Use uppercase L for long literals
>   
>   Co-authored-by: Andrey Turbanov <turbanoff at gmail.com>

Marked as reviewed by redestad (Reviewer).

-------------

PR Review: https://git.openjdk.org/jdk/pull/20738#pullrequestreview-2267222497