RFR: 8273152: Store base archive path in CDSFileMapHeaderBase [v3]

[Yumin Qi]

> Store base archive path offset in CDSFileMapHeaderBase (which should be invariant in evolving versions) so we can read the base archive name reliably from dynamic archive even with variant header sizes over versions.
> 
> tests: tier1-4
> 
> Thanks
> Yumin

Yumin Qi has updated the pull request incrementally with one additional commit since the last revision:

  Moved _base_archive_name_size to CDSFileMapHeaderBase and made checking consistency in function check_archive

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/5584/files
  - new: https://git.openjdk.java.net/jdk/pull/5584/files/d82587fb..e515c31b

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=5584&range=02
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=5584&range=01-02

  Stats: 73 lines in 6 files changed: 43 ins; 20 del; 10 mod
  Patch: https://git.openjdk.java.net/jdk/pull/5584.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/5584/head:pull/5584

PR: https://git.openjdk.java.net/jdk/pull/5584