* lisp/progmodes/compile.el (compilation--flush-directory-cache):

* lisp/progmodes/compile.el (compilation--flush-directory-cache):
New function, extracted from compilation--remove-properties.
(compilation--remove-properties, compilation--parse-region): Use it.
(compilation--previous-directory): Handle one more case.
(compilation-enable-debug-messages): Remove.
(compilation-parse-errors, compilation--flush-parse): Just remove the
left over debug messages.