RFR: 8367737: Parallel: Retry allocation after lock acquire in mem_allocate_work

[Albert Mingkun Yang]

On Tue, 16 Sep 2025 09:40:10 GMT, Albert Mingkun Yang <ayang at openjdk.org> wrote:

> Restoring the allocation retrying logic inside lock-region to avoid premature GCs. This logic was mistakenly removed in [JDK-8365557](https://bugs.openjdk.org/browse/JDK-8365557).
> 
> Test: tier1-3

Thanks for review.

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PR Comment: https://git.openjdk.org/jdk/pull/27308#issuecomment-3302341124