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## Why this should be merged
Performs trie prefetching concurrently, required for equivalent
performance with `coreth` / `subnet-evm` implementations.
## How this works
`StateDB.StartPrefetcher()` accepts variadic options (for backwards
compatibility of function signatures). An option to specify a
`WorkerPool` is provided which, if present, is used to call
`Trie.Get{Account,Storage}()`; the pool is responsible for concurrency
but does not need to be able to wait on the work as that is handled by
this change.
## How this was tested
Unit test demonstrating hand-off of work to a `WorkerPool` as well as
API-guaranteed ordering of events.
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| .. | ||
| ethtest | ||
| hookstest | ||
| options | ||
| pseudo | ||
| sync | ||
| testonly | ||
| interfaces_test.go | ||
| libevm.go | ||