AVM: fix instruction -> AvmContext -> decodeFromBytecode dependency cycle in simulator

[fcarreiro]

fix instruction -> avm_context -> decodeFromBytecode dependency cycle

[dbanks12]

Is this still a cycle?

[dbanks12]

(i think it is, but just confirming)

[fcarreiro]

Hi yes, it still is! Now it's bigger because we go through executor.ts. It's unlikely that it can be removed completely as long as the simulator calls itself.