[lworld] RFR: 8265423: [lworld] Provide experimental support for generating a single class file per primitive class

[Srikanth Adayapalam]

Use -XDunifiedValRefClass option to javac to get unified class file generation for primitive classes. Note: Javac will require some tweaks to consume such files, this is WIP.

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Commit messages:
 - 8265423: [lworld] Provide experimental support for generating a single class file per primitive class

Changes: https://git.openjdk.java.net/valhalla/pull/394/files
 Webrev: https://webrevs.openjdk.java.net/?repo=valhalla&pr=394&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8265423
  Stats: 49 lines in 7 files changed: 28 ins; 1 del; 20 mod
  Patch: https://git.openjdk.java.net/valhalla/pull/394.diff
  Fetch: git fetch https://git.openjdk.java.net/valhalla pull/394/head:pull/394

PR: https://git.openjdk.java.net/valhalla/pull/394