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Auto merge of #126556 - saethlin:layout-precondition, r=joboet
Add a precondition check for Layout::from_size_align_unchecked
Ran into this while looking into https://github.com/rust-lang/miri/issues/3679. This is of course not the cause of the ICE, but the reproducer doesn't encounter a precondition check and it ought to.
