[lworld] RFR: 8376843: [lworld] add more regression tests for local variable proxies

[Vicente Romero]

adding some additional regression tests for local proxy variables

TIA

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Commit messages:
 - 8376843: [lworld] add more regression tests for local variable proxies

Changes: https://git.openjdk.org/valhalla/pull/2008/files
  Webrev: https://webrevs.openjdk.org/?repo=valhalla&pr=2008&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8376843
  Stats: 266 lines in 5 files changed: 240 ins; 12 del; 14 mod
  Patch: https://git.openjdk.org/valhalla/pull/2008.diff
  Fetch: git fetch https://git.openjdk.org/valhalla.git pull/2008/head:pull/2008

PR: https://git.openjdk.org/valhalla/pull/2008