Parsing_aux: simplify compare_pos
Parsing_aux: simplify compare_pos

neojski/merlin,chriskonstad/merlin,dra27/merlin,the-lambda-church/merlin,fxfactorial/merlin,rgrinberg/merlin,rgrinberg/merlin,neojski/merlin,ocaml/merlin,ocaml/merlin,neojski/merlin,neojski/merlin,ocaml/merlin,chambart/merlin,the-lambda-church/merlin,chambart/merlin,dra27/merlin,haselwarter/merlin,haselwarter/merlin,chriskonstad/merlin,chambart/merlin,fxfactorial/merlin,fxfactorial/merlin,dra27/merlin,chambart/merlin,fxfactorial/merlin,haselwarter/merlin,ocaml/merlin,the-lambda-church/merlin,dra27/merlin,rgrinberg/merlin,rgrinberg/merlin,haselwarter/merlin