Fix word boundary assertions under C++20 #90
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See intel#345.
Word boundary assertions are basically broken when using modern stdlib (with P1614R2 implemented). This is caused by breaking change in
std::paircomparison operators (after P1614R2std::pairusesoperator<=>).For more context on breaking change, see
https://www.reddit.com/r/cpp/comments/ra5cpy/the_spacesship_operator_silently_broke_my_code/