RFR: 8302781: CDS archive heap not reproducible after JDK-8296344 [v2]

[Ioi Lam]

> [JDK-8296344](https://bugs.openjdk.org/browse/JDK-8296344) changed the order of when `oopDesc::identity_hash()` is called for the archived heap object.
> 
> This one-liner fix restores the order, so that we initialize the `identity_hash` part of the archived object headers predictably.
> 
> Please see [my comment in the JBS report](https://bugs.openjdk.org/browse/JDK-8302781?focusedCommentId=14561163&page=com.atlassian.jira.plugin.system.issuetabpanels%3Acomment-tabpanel#comment-14561163) for details.

Ioi Lam has updated the pull request incrementally with one additional commit since the last revision:

  fixed typo

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/12628/files
  - new: https://git.openjdk.org/jdk/pull/12628/files/0eb32cf9..a0c87ac5

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=12628&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=12628&range=00-01

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/12628.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/12628/head:pull/12628

PR: https://git.openjdk.org/jdk/pull/12628