[lworld] RFR: Make "PrimitiveParameterizedClass.default" a poly expression. [v3]

[Jesper Steen Møller]

> Make .default a separate node type in the parser.
> 
> ## Issue
> [JDK-8211914](https://bugs.openjdk.java.net/browse/JDK-8211914): [lworld] Javac should support type inference for default value creation
> 
> Note: The Linux x86 builds in GitHub actions seem to fail with something completely unrelated to these changes.

Jesper Steen Møller has updated the pull request incrementally with one additional commit since the last revision:

  Handle default values as polytype method arguments.

-------------

Changes:
  - all: https://git.openjdk.java.net/valhalla/pull/369/files
  - new: https://git.openjdk.java.net/valhalla/pull/369/files/e9289cfa..0c088269

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=valhalla&pr=369&range=02
 - incr: https://webrevs.openjdk.java.net/?repo=valhalla&pr=369&range=01-02

  Stats: 108 lines in 5 files changed: 95 ins; 10 del; 3 mod
  Patch: https://git.openjdk.java.net/valhalla/pull/369.diff
  Fetch: git fetch https://git.openjdk.java.net/valhalla pull/369/head:pull/369

PR: https://git.openjdk.java.net/valhalla/pull/369