jlink: pre-generate lambda classes

[Dan Heidinga]

I've updated my jlink patch to pregenerate lambda classes [0] so it works
with the current Leyden repo and the updated classfile api (which is
awesome - check it out if you haven't yet!).  Previously discussed in the
"Bytecode transformation investigation" thread [1].

I'd like to push it to an experimental branch here on the leyden repo so
that others can freely pick up and experiment with the code.  Would that be
possible?

My local branch is called "pregenerate-lambdas" but any name would work for
me.

The patch pre-generates during jlink time classes for non-Serializable
lambda expressions and uses NestMates to handle access to the private
implementation method.  It's a good example of the kinds of changes needed
to shift runtime-generated classes to jlink time.

Still lots to update but worth getting into Leyden repo so the code is
shareable.

Mark / Brian - is it possible to get an experimental branch on the leyden
repo for this patch?

--Dan

[0]
https://github.com/openjdk/leyden/compare/master...DanHeidinga:leyden:pregenerate-lambdas?expand=1

[1] https://mail.openjdk.org/pipermail/leyden-dev/2022-August/000055.html
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