Upstream patch: add sharedStorage for prefetching to L1 #10
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Description
From: #792
In the previous prefetch behavior of importing blocks, the prefetch and the main process use completely different state dbs, the prefetch process can only put the retrieved data into the L3 layer, if the main process wants to access, it must go through the L1-L2-L3 layers, the new design let the main process and the prefetch process share a shared_pool with the stateDB. This pool stores the originStorage data (each stateobjects has the corresponding entry ). By this way , the prefetch data that can be directly fished to the L1 layer This shared_pool can be represented as the following secondary map structure, which is a private member variable in stateDB , each stateObjects has pointer to access the Corresponding entry of shared_pool