[clang-tidy] Checker for inefficient use of algorithms on associative containers

Summary:
Associative containers implements some of the algorithms as methods which
should be preferred to the algorithms in the algorithm header. The methods
can take advantage of the order of the elements.

Reviewers: alexfh

Reviewed By: alexfh

Subscribers: cfe-commits

Differential Revision: http://reviews.llvm.org/D7246

llvm-svn: 228505