scripted-diff: Use nodiscard (C++17) instead of NODISCARD
-BEGIN VERIFY SCRIPT- sed -i "s/NODISCARD/[[nodiscard]]/g" $(git grep -l "NODISCARD" ":(exclude)src/bench/nanobench.h" ":(exclude)src/attributes.h") -END VERIFY SCRIPT-
Remove NODISCARD
This is a backport of core#20499
Depends on D10888