RFR: 8293187: Store initialized Enum classes in AOTCache

[Ioi Lam]

This is the 4th PR for [JEP 483: Ahead-of-Time Class Loading & Linking](https://bugs.openjdk.org/browse/JDK-8315737).

**Problem:**

This PR is necessary to support [JDK-8293336: AOT-linking of invokedynamic for lambda expression and string concat](https://bugs.openjdk.org/browse/JDK-8293336), which needs to store [`sun.invoke.util.Wrapper`](https://github.com/openjdk/jdk/blob/c3711dc90980fb3e63ff199612c201c4464626bf/src/java.base/share/classes/sun/invoke/util/Wrapper.java) enums in the AOT cache. Although CDS has some limited support for storing enums, the `Wrapper` type is too complex for the existing solution to handle. Please see the JBS issue for details.

**Solution:**

In the assembly phase, we store the initialized states of the `Wrapper` class (captured in a `java.lang.Class` object, a.k.a. the *mirror* of this class) into the AOT cache. 

In production run, we no longer execute `Wrapper::<clinit>`, because all the static fields (contained in its mirror) are already initialized.

**Review Notes:**

- The new capability is controlled by `CDSConfig::is_initing_classes_at_dump_time()`. We can aot-initialize classes only if `-XX:+AOTClassLinking`  is enabled.
    - The old (more limited) support for enums is still there (it's required when `AOTClassLinking` is disabled). See the call to `CDSEnumKlass::handle_enum_obj()` in heapShared.cpp. 
- `AOTClassInitializer::can_archive_initialized_mirror()` decides what classes can be aot-initialized. This is currently a very small set of classes, but will expand in [JDK-8293336](https://bugs.openjdk.org/browse/JDK-8293336)
- Before, `HeapShared::archive_java_mirrors()` would clear out all the states in the archived mirrors. With this PR, the states of aot-initialized classes are preserved via `HeapShared::copy_aot_initialized_mirror()`.
- During the early state of the production run, `AOTLinkedClassBulkLoader::init_required_classes_for_loader()` is called to make sure that:
    - all aot-initialized classes are moved into the `initialized` state (without executing its `<clinit>` method). This is done in `InstanceKlass::initialize_from_cds()`
    - the classes of all the objects that are reachable from the aot-initialized mirrors are initialized. See comments above ` HeapShared::init_classes_reachable_from_archived_mirrors()` 

**Caveats:**

Not all Enum classes can be stored in the initialized state. E.g., some Enums might have static fields that depend on the environment:


enum Foo {
    [....]
    static final long TIME = System.currentTimeMillis();
}


Therefore, this PR does not expose this capability for general usage. Currently, only a small set of Enums are stored in the archived heap, whose contents are carefully limited by tables in heapShared.cpp. We assume that none of the archived Enums have environment dependencies.

Obviously a better mechanism (AOT object creation API, static analysis, etc) will be needed before this capability can be opened up.

---
See [here](https://bugs.openjdk.org/browse/JDK-8315737) for the sequence of dependent RFEs for implementing JEP 483.

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

Depends on: https://git.openjdk.org/jdk/pull/20843

Commit messages:
 - Clean up; removed unrelated changes in classPrinter.cpp
 - more cleanup
 - Merge branch 'jep-483-step-03-8329706-implement-xx-aot-class-linking' of /jdk3/yak/open into jep-483-step-04-8293187-support-sun-invoke-util-wrapper-in-cds-archive-heap
 - More clean up for JDK-8293187
 - Merge branch 'jep-483-step-03-8329706-implement-xx-aot-class-linking' of /jdk3/yak/open into jep-483-step-04-8293187-support-sun-invoke-util-wrapper-in-cds-archive-heap
 - Merge branch 'jep-483-step-03-8329706-implement-xx-aot-class-linking' into jep-483-step-04-8293187-support-sun-invoke-util-wrapper-in-cds-archive-heap
 - Merge branch 'jep-483-step-03-8329706-implement-xx-aot-class-linking' into jep-483-step-04-8293187-support-sun-invoke-util-wrapper-in-cds-archive-heap
 - Simplified implemented by AOTClassInitializer.
 - 8293187: Support sun.invoke.util.Wrapper in CDS archive heap

Changes: https://git.openjdk.org/jdk/pull/20958/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=20958&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8293187
  Stats: 814 lines in 20 files changed: 742 ins; 16 del; 56 mod
  Patch: https://git.openjdk.org/jdk/pull/20958.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/20958/head:pull/20958

PR: https://git.openjdk.org/jdk/pull/20958