[PATCH] Add .clang-tidy configuration file to provide LLVM-optimized defaults forclang-tidy.

[Alexander Kornienko]

>>! In D5236#7, @djasper wrote:
> The only question we might think about in the long(er) run is whether we really want ".clang-tidy" here but keep clang-tidy in clang-tools-extra.

Yes, we should think about moving clang-tidy to the main tree. But I don't think the location of clang-tidy sources matters in this context. The file in question is a tool configuration file. We also have .arcconfig and .gitignore here, but nobody asks whether it's fine that the relevant tools are developed separately ;)

http://reviews.llvm.org/D5236