optimized `std::stack` usage in `simplecpp::TokenList::combineOperators()`#659

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Commits on Jun 10, 2026

use `std::vector` as underlying container for `std::stack` in `simplecpp::TokenList::combineOperators()`
firewave
committed
initialize `std::stack` with intial value instead of inserting it in `simplecpp::TokenList::combineOperators()`
firewave
committed