8237067: Implementation of <anyType>.default - (lworld branch)

[Jesper Steen Møller]

Hi people (or Norse gods ?)

Here's an attempted patch for JDK-8237067. It works with tier1 and 2 tests against the lworld tip, so I think it’s ready for review.

The purpose of the change is described in the ticket. As per the discussion in the week-end [1], default values are NOT introduced as constant expressions.

-Jesper

[1]: https://mail.openjdk.java.net/pipermail/valhalla-dev/2020-January/006713.html

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