core/vm: use uint256 in EVM implementation (#20787)
* core/vm: use fixed uint256 library instead of big * core/vm: remove intpools * core/vm: upgrade uint256, fixes uint256.NewFromBig * core/vm: use uint256.Int by value in Stack * core/vm: upgrade uint256 to v1.0.0 * core/vm: don't preallocate space for 1024 stack items (only 16) Co-authored-by: Martin Holst Swende <martin@swende.se>
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