RFR: 8298610: Refactor archiving of ConstantPool::resolved_references()

[Ioi Lam]

This is another prerequisite for [JDK-8296344](https://bugs.openjdk.org/browse/JDK-8296344).

Before this PR, when archiving the objArray of `ConstantPool::resolved_references()` 
- We call `HeapShared::find_archived_heap_object()` to look up archived copies of the Strings.
- We allocate a copy of the objArray inside a safepoint.

This violates the requirements [1] and [2] as stated in [JDK-8298600](https://bugs.openjdk.org/browse/JDK-8298600). 

After this PR, we no longer do the above.

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Commit messages:
 - 8298610: Refactor archiving of ConstantPool::resolved_references()

Changes: https://git.openjdk.org/jdk/pull/12021/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=12021&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8298610
  Stats: 47 lines in 6 files changed: 20 ins; 10 del; 17 mod
  Patch: https://git.openjdk.org/jdk/pull/12021.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/12021/head:pull/12021

PR: https://git.openjdk.org/jdk/pull/12021