fix binaryFun

Old log:#2720
Remove import of half of phobos for 100% cases in phobos.

`sort`, `cmp`, `find`, `startsWith`,  `sum` and other algorithms would be compiled faster.

See also: [Issue 13253 - use more scoped imports in phobos](https://issues.dlang.org/show_bug.cgi?id=13253)
Yeah I think we should keep debug statements out of Phobos code, unless it is universally useful to all Phobos developers. You can of course use them while developing your PR, but I'd propose removing them before merging into master.