RFR: 8307765: DynamicArchiveHeader contents are missing in CDS mapfile

[Ashutosh Mehra]

This change adds DynamicArchiveHeader contents in the mapfile generated for a dynamic CDS archive.
The additional fields that appears in the header section of the cds mapfile are:

- base_header_crc:                <value>
- base_region_crc[0]:             <value>
- base_region_crc[1]:             <value>
- base_region_crc[2]:             <value>
- base_region_crc[3]:             <value>

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Commit messages:
 - 8307765: DynamicArchiveHeader contents are missing in CDS mapfile

Changes: https://git.openjdk.org/jdk/pull/13891/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=13891&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8307765
  Stats: 20 lines in 4 files changed: 17 ins; 2 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/13891.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/13891/head:pull/13891

PR: https://git.openjdk.org/jdk/pull/13891