RFR: 8357944: Remove unused CollectedHeap::is_maximal_no_gc

[Joel Sikström]

On Wed, 28 May 2025 07:17:14 GMT, Albert Mingkun Yang <ayang at openjdk.org> wrote:

> Removing effectively dead code/API for all GCs except G1.

Looks good. This code is quite old, but I wonder if it's also appropriate to rename `is_maximal_no_gc()` to something more descriptive, maybe `is_expandable()` and reverse the check, which I think looks better at the callers of `is_maximal_no_gc()`. Not sure if that should be done separately or not though, and I don't have strong opinions on G1 code.

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Marked as reviewed by jsikstro (Committer).

PR Review: https://git.openjdk.org/jdk/pull/25482#pullrequestreview-2881111569