[clang-tidy] check_clang_tidy_fix.sh -> check_clang_tidy.sh

Summary: Make the script suitable for checking just messages. Move most of the tests to use it. Clean up the tests: shorten messages, insert line numbers, remove unnecessary RUN: lines, etc.

Reviewers: klimek

Reviewed By: klimek

Subscribers: curdeius, cfe-commits

Differential Revision: http://reviews.llvm.org/D5989