RFR: 8296754: AutoCreateSharedArchive in JDK 20 is not compatible with JDK 19 [v4]

[Matias Saavedra Silva]

> The -XX:+AutoCreateSharedArchive flag was implemented in JDK 19, however, this flag doesn't work across JDK 19 and 20.
> 
> Expected: JDK 20 should recreate the specified CDS archive
> Actual: JDK 20 cannot recognize the archive file and gives up
> 
> The new field from GenericCDSFileMapHeader is now in FileMapHeader. Verified with tier 1-4 tests.

Matias Saavedra Silva has updated the pull request incrementally with one additional commit since the last revision:

  Removed unused import

-------------

Changes:
  - all: https://git.openjdk.org/jdk/pull/11148/files
  - new: https://git.openjdk.org/jdk/pull/11148/files/4d168999..25e5ff72

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=11148&range=03
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=11148&range=02-03

  Stats: 2 lines in 1 file changed: 0 ins; 1 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/11148.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/11148/head:pull/11148

PR: https://git.openjdk.org/jdk/pull/11148