[lworld] RFR: 8244231: [lworld] Add support for ref-default and val-default inline classes.

[Srikanth Adayapalam]

Code changes and tests

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Commit messages:
 - Fix white space problems
 - Fix white space problems
 - Modify several existing tests to verify behavior with reference default classes
 - 8244231: Add support for ref-default and val-default inline classes.

Changes: https://git.openjdk.java.net/valhalla/pull/482/files
 Webrev: https://webrevs.openjdk.java.net/?repo=valhalla&pr=482&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8244231
  Stats: 3536 lines in 112 files changed: 3358 ins; 70 del; 108 mod
  Patch: https://git.openjdk.java.net/valhalla/pull/482.diff
  Fetch: git fetch https://git.openjdk.java.net/valhalla pull/482/head:pull/482

PR: https://git.openjdk.java.net/valhalla/pull/482