`cover_or_fail!` macro #7769

Job	Run time
benchcomp-tests	7m 31s
documentation	2m 5s
perf	26m 36s
regression (macos-13)	39m 4s
write-json-symtab-regression	19m 26s
regression (ubuntu-20.04)	27m 22s
regression (ubuntu-22.04)	29m 3s
regression (macos-14)	27m 41s
	2h 58m 48s

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