[lworld] RFR: 8309357: [lworld] CDS is broken with InlineKlasses after the merge

[Frederic Parain]

Fix the restoration of the internal pointer to the inlineklass_fixed_block when an InlineKlass is loaded from a CDS archive.
Fix the setting of the new calling convention flags when the constMethod object is shared through CDS.

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Commit messages:
 - Fix inlineklass_fixed_block ptr and calling convention flags setting

Changes: https://git.openjdk.org/valhalla/pull/883/files
 Webrev: https://webrevs.openjdk.org/?repo=valhalla&pr=883&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8309357
  Stats: 15 lines in 4 files changed: 9 ins; 3 del; 3 mod
  Patch: https://git.openjdk.org/valhalla/pull/883.diff
  Fetch: git fetch https://git.openjdk.org/valhalla.git pull/883/head:pull/883

PR: https://git.openjdk.org/valhalla/pull/883