RFR: 8374048: Genshen: Backout fix for missed cancellation notice

[Y. Srinivas Ramakrishna]

On Thu, 18 Dec 2025 21:51:54 GMT, William Kemper <wkemper at openjdk.org> wrote:

> The "fix" for the relatively infrequent bug: https://bugs.openjdk.org/browse/JDK-8373100, is causing a frequent `nullptr` error. We are backing out the problematic fix while we work on a better solution.

Marked as reviewed by ysr (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/28910#pullrequestreview-3595644797