[lworld] RFR: 8373442: [lworld] Fix CDS heap dumping crashes [v2]

[Coleen Phillimore]

> This fixes three crashes in when heap dumping is enabled with Matias's patch.
> Tested with tier1-3, that doesn't exactly turn on valhalla and some --enable-valhalla testing locally.

Coleen Phillimore has updated the pull request incrementally with one additional commit since the last revision:

  Add comment that archiving flattened arrays with oops in the inline class element type is not supported.

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Changes:
  - all: https://git.openjdk.org/valhalla/pull/1784/files
  - new: https://git.openjdk.org/valhalla/pull/1784/files/19437153..c01ef0a2

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=valhalla&pr=1784&range=01
 - incr: https://webrevs.openjdk.org/?repo=valhalla&pr=1784&range=00-01

  Stats: 2 lines in 1 file changed: 2 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/valhalla/pull/1784.diff
  Fetch: git fetch https://git.openjdk.org/valhalla.git pull/1784/head:pull/1784

PR: https://git.openjdk.org/valhalla/pull/1784