RFR: 8372110: GenShen: Fix erroneous assert

[Y. Srinivas Ramakrishna]

On Tue, 18 Nov 2025 15:40:35 GMT, Kelvin Nilsen <kdnilsen at openjdk.org> wrote:

> Code recently integrated (https://github.com/openjdk/jdk/pull/27353) had an erroneous (meaningless) assert.  Closer examination of intended behavior revealed that the fix involves replacing the assert with a new run-time check, as implemented here.

Marked as reviewed by ysr (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/28375#pullrequestreview-3485431864