RFR: 8367739: Serial: Retry allocation after lock acquire in mem_allocate_work

[Thomas Schatzl]

On Wed, 17 Sep 2025 10:46:56 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-8364628](https://bugs.openjdk.org/browse/JDK-8364628).
> 
> Test: tier1-3

Marked as reviewed by tschatzl (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/27340#pullrequestreview-3240331291