RFR: 8364019: Add alignment precondition to Universe::reserve_heap

[Albert Mingkun Yang]

On Thu, 24 Jul 2025 10:06:17 GMT, Albert Mingkun Yang <ayang at openjdk.org> wrote:

> Simple converting a redundant `align_up` to assert.
> 
> Test: tier1

Thanks for review.

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PR Comment: https://git.openjdk.org/jdk/pull/26456#issuecomment-3127448977