Michał Chojnowski f00bed9429 sstables: partition_index_cache: deglobalize stats ...

Move partition_index_cache stats from a thread_local variable
to cache_tracker. After the change, partition_index_cache
receives a reference to the stats via constructor, instead of
referencing a global.

This is needed so that cache_tracker can know the memory usage
of index caches (for cache eviction purposes) without relying on
globals.

But it also makes sense even without that motive.

2023-09-01 22:34:41 +02:00

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