[lworld] RFR: 8374165: [lworld] Shortcut in value copying can lead to incorrect substitutability tests

[Frederic Parain]

Remove an optimization in value copying that could cause incorrect results with the new substitutability test method.

Tested with Mach5 tier 1-3.

Thank you,

Fred

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Commit messages:
 - Merge remote-tracking branch 'upstream/lworld' into subst_shortcut
 - Remove shortcut in value copying

Changes: https://git.openjdk.org/valhalla/pull/1869/files
  Webrev: https://webrevs.openjdk.org/?repo=valhalla&pr=1869&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8374165
  Stats: 5 lines in 1 file changed: 0 ins; 4 del; 1 mod
  Patch: https://git.openjdk.org/valhalla/pull/1869.diff
  Fetch: git fetch https://git.openjdk.org/valhalla.git pull/1869/head:pull/1869

PR: https://git.openjdk.org/valhalla/pull/1869