Reference to popped stack element

[CblPOK-git]

We don't write anything to stack after pop(), so everything works fine, but looks really bad. Maybe better to use
auto& val = stack[i]
instead of
auto& val = stack.pop()
(it will change address_in_stack and rw_circuit tests will start to fail, will need to also update tests)

evm-assigner/lib/assigner/evmone/instructions.hpp

Line 402 in cfb97c9

const auto& x = stack.pop();