Make control-flow more transparent #12502

Job	Run time
gobview (ubuntu-22.04, ocaml-variants.4.14.2+options,ocaml-option-flambda, 14)	7m 46s
regression (ubuntu-22.04, ocaml-variants.4.14.2+options,ocaml-option-flambda)	9m 3s
regression (macos-13, ocaml-variants.4.14.2+options,ocaml-option-flambda)	19m 16s
extraction	0s
	36m 5s

Provide feedback