Hampus Fröjdholm 61f1b2db70 gpa: Add helper to calculate size class of empty buckets
Empty buckets have their `alloc_cursor` set to `slot_count` to allow the
size class to be calculated later. This happens deep within the free
function.

This adds a helper and a test to verify that the size class of empty
buckets is indeed recoverable.
2024-05-18 11:43:42 +02:00
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