[include-fixer] collect the number of times a symbols is found in an indexing...

[include-fixer] collect the number of times a symbols is found in an indexing run and use it for symbols popularity ranking.

Summary:
[include-fixer] collect the number of times a symbols is found in an
indexing run and use it for symbols popularity ranking.

Reviewers: bkramer

Subscribers: cfe-commits, hokein, djasper

Differential Revision: http://reviews.llvm.org/D20804

llvm-svn: 271268