RFR: 8298048: Combine CDS archive heap into a single block [v7]

[Ioi Lam]

> This PR combines the "open" and "closed" regions of the CDS archive heap into a single region. This significantly simplifies the implementation, making it more compatible with non-G1 collectors. There's a net removal of ~1000 lines in src code and another ~1200 lines of tests.
> 
> **Notes for reviewers:**
> - Most of the code changes in CDS are removing the handling of "open" vs "closed" objects.
>   - Reviewers can start with ArchiveHeapWriter::copy_source_objs_to_buffer().
>   - It might be easier to see the diff with whitespaces off.
> - There are two major changes in the G1 code
>   - The archived objects are now stored in the "old" region (see g1CollectedHeap.cpp in [58d720e](https://github.com/openjdk/jdk/pull/13284/commits/58d720e294bb36f21cb88cddde724ed2b9e93770))
>   - The majority of the other changes are removal of the "archive" region type (see heapRegionType.hpp). For ease of review, such code is isolated in [a852dfb](https://github.com/openjdk/jdk/pull/13284/commits/a852dfbbf5ff56e035399f7cc3704f29e76697f6)
> - Testing changes:
>   - Now the archived java objects can move, along with the "old" regions that contain them. It's no longer possible to test whether a heap object came from CDS. As a result, the `WhiteBox.isShared(Object o)` API has been removed.
>   - Many tests that uses this API are removed. Most of them were written during early development of CDS archived objects and are no longer relevant.
> 
> **Testing:**
> - Mach5 tiers 1 ~ 7

Ioi Lam has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains 21 commits:

 - Merge branch 'master' into 8298048-combine-cds-heap-to-single-region-PUSH
 - Fixed assert in runtime/cds/appcds/SharedArchiveConsistency.java
 - Removal of JFR custom closed/open archive region types
 - Remove g1 full gc skip marking optimization
 - Some comment updates
 - Move g1collectedheap archive related regions together in the cpp file
 - Factor out region/range iteration
 - Fix comment
 - Ioi fix
 - fixed merge
 - ... and 11 more: https://git.openjdk.org/jdk/compare/0f3828dd...8a35c7ee

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Changes: https://git.openjdk.org/jdk/pull/13284/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=13284&range=06
  Stats: 3252 lines in 83 files changed: 159 ins; 2446 del; 647 mod
  Patch: https://git.openjdk.org/jdk/pull/13284.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/13284/head:pull/13284

PR: https://git.openjdk.org/jdk/pull/13284