[lworld] RFR: 8252753: [lworld] Merge of jdk-16+12 broke CDS for inline types

[Ioi Lam]

This fixes handling of inline types by CDS -- implemented handling of MetaspaceClosure::_internal_pointer_ref

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Commit messages:
 - 8252753: [lworld] Merge of jdk-16+12 broke CDS for inline types

Changes: https://git.openjdk.java.net/valhalla/pull/179/files
 Webrev: https://webrevs.openjdk.java.net/?repo=valhalla&pr=179&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8252753
  Stats: 37 lines in 2 files changed: 26 ins; 6 del; 5 mod
  Patch: https://git.openjdk.java.net/valhalla/pull/179.diff
  Fetch: git fetch https://git.openjdk.java.net/valhalla pull/179/head:pull/179

PR: https://git.openjdk.java.net/valhalla/pull/179