nir: Fix non-determinism in lower_global_vars_to_local
Using a hash-table walk means that variables will get inserted in different orders on different runs. Just walk the list of globals instead, even if some of them can't be turned into locals.
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Using a hash-table walk means that variables will get inserted in different orders on different runs. Just walk the list of globals instead, even if some of them can't be turned into locals.