secp256k1: ported BitCurve.Add changes#1

AskAlexSharov merged 1 commit into

erigontech:mainerigontech/secp256k1:mainfrom

iszubok:2680-To-port-bitcurve.add-changesiszubok/secp256k1:2680-To-port-bitcurve.add-changesCopy head branch name to clipboard