build

Compiler: restore TCO of mutually recursive functions #2257

Job	Run time
lint-fmt	2m 44s
build (ubuntu-latest, 4.08.x, true, true, true)	3m 15s
build (ubuntu-latest, 4.09.x, true, true, true)	2m 53s
build (ubuntu-latest, 4.10.x, true, true, true)	2m 47s
build (ubuntu-latest, 4.11.x, true, true, true)	2m 37s
build (ubuntu-latest, 4.12.x, true, true, true)	2m 59s
build (ubuntu-latest, 4.13.x, true, true, true)	2m 50s
build (ubuntu-latest, 5.0.x, true, true, true)	3m 21s
build (ubuntu-latest, 4.14.x, true, false, true)	7m 14s
build (macos-latest, 4.14.x, true, false, true)	15m 40s
build (windows-latest, 4.14.x, true, false, true)	19m 22s
build (ubuntu-latest, 5.1.x, false, false, false)	11m 2s
build (macos-latest, 5.1.x, true, false, true)	16m 38s
build (windows-latest, ocaml.5.1.0,ocaml-option-mingw, false, false, true)	22m 25s
	1h 55m 47s

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