RFR: javac support for Parametric VM, first stab [v3]

[Vicente Romero]

On Fri, 12 Mar 2021 22:28:12 GMT, Rémi Forax <github.com+828220+forax at openjdk.org> wrote:

>> That is during class reading - where we don't care about the "id" anymore. The "id" is just a "fiction" when writing, to help us generating multiple CP holes (possibly with the same kind).
>
> Ok, i did not think about that part of the process, and you do not do any roundtrip, reader - >  javac -> gen,
> thanks

right roundtrips shouldn't happen, this is why we have this duality on the constructors

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PR: https://git.openjdk.java.net/valhalla/pull/364