[CodeComplete] Add completions for filenames in #include directives.

Authored by sammccall on Sep 18 2018, 1:40 AM.


[CodeComplete] Add completions for filenames in #include directives.

The dir component ("somedir" in #include <somedir/fo...>) is considered fixed.
We append "foo" to each directory on the include path, and then list its files.

Completions are of the forms:
#include <somedir/fo^


The filter is set to the filename part ("fo"), so fuzzy matching can be
applied to the filename only.

No fancy scoring/priorities are set, and no information is added to
CodeCompleteResult to make smart scoring possible. Could be in future.

Reviewers: ilya-biryukov

Subscribers: cfe-commits

Differential Revision: https://reviews.llvm.org/D52076

llvm-svn: 342449