restore: minor optimizations #7562
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Removes the slot field from account_meta (runtime layer). The database layer is aware of the slot numbers in which accounts change anyways. This saves 8 bytes per account and removes a cache miss during snapshot loading (checking if a duplicate account is newer or obsolete). This is a low-risk change because the slot field is not consensus- relevant outside of snapshot loading.
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Baseline: 157.3 seconds
optimize funk_rec allocs: 153.0 seconds
move slot field to DB layer: 151.8 seconds