RFR: 8364541: Parallel: Support allocation in old generation when heap is almost full

[Paul Hohensee]

On Fri, 1 Aug 2025 15:36:06 GMT, Albert Mingkun Yang <ayang at openjdk.org> wrote:

> Adding old-gen allocation support in heap-almost-full scenario. This can make tests that cause OOM deliberately more resilient to timeout and help runaway apps to exit/fail faster.
> 
> Test: tier1-3

Good idea. :)

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Marked as reviewed by phh (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/26599#pullrequestreview-3099040440