core/state, tests: fix memory leak via fastcache #1775
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This change fixes a memory leak, when running either state-tests or blockchain-tests, we allocate a `1MB` fastcache during snapshot generation. `fastcache` is a bit special, and requires a `Reset()` (it has it's own memory allocator). The `1MB` was hidden [here](https://github.com/ethereum/go-ethereum/blob/master/tests/state_test_util.go#L333) and [here](https://github.com/ethereum/go-ethereum/blob/master/tests/block_test_util.go#L146) respectively.
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This change fixes a memory leak, when running either state-tests or blockchain-tests, we allocate a
1MBfastcache during snapshot generation.fastcacheis a bit special, and requires aReset()(it has it's own memory allocator).