Reduce allocations when pretty printing JCTree during compilation

[christoph.dreis at freenet.de]

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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