RFR: 8366474: Rename MetaspaceObj::is_shared() to MetaspaceObj::in_aot_cache() [v2]

[Chen Liang]

On Sat, 30 Aug 2025 17:34:38 GMT, Ioi Lam <iklam at openjdk.org> wrote:

>> This PR is one (of many) steps in [JDK-8366473](https://bugs.openjdk.org/browse/JDK-8366473) (Refactor CDS source code with new AOT terminology):
>> 
>> Rename `is_shared()` in `Metaspace` (and various other classes) to `in_aot_cache()` to reflect its true meaning:
>> - tests if an object is inside the AOT cache's metaspace region.
>> 
>> Also various forms of  "shared metaspace" are updated to "aot metaspace"
>> 
>> Please start your review with allocations.hpp
>
> Ioi Lam has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Removed MetaspaceShared -> AOTMetaspace changes that are intended for https://github.com/openjdk/jdk/pull/27017

This rename is absolutely clarifying. Did not review the technical aspects of hotspot.

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Marked as reviewed by liach (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/27016#pullrequestreview-3183181361