Reduce allocations when pretty printing JCTree during compilation

[Vicente Romero]

Hi Christoph,

What are the performance benefits you get from this patch? My 
understanding is that your patch reduces the memory footprint but it 
seems like there are also performance benefits, I think. The patch looks 
good and won't affect readability although some comments should be added 
to the new `print` version to explain why it is a better fit for 
printing chars,

Thanks,
Vicente

On 2/20/23 13:54, christoph.dreis at freenet.de wrote:
>
> Hi,
>
> I’ve been profiling some build pipelines of some customer projects – 
> including their compilation phase.
>
> And while Lombok is a major contributor in these projects (it’s not an 
> option to drop it unfortunately), there are some optimization 
> opportunities in the JDK itself.
>
> I’ve opened a draft PR where you can find more information: 
> https://github.com/openjdk/jdk/pull/12667
>
> If someone finds the time to take a look, I’d highly appreciate it.
>
> Cheers,
>
> Christoph
>
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