Removing Clang-modernize

Hi!

I think will be good idea to remove Clang-modernize at least from
installation if not from build or even source tree before 3.8 release.

Functionality was moved to Clang-tidy already. Old conversions were
improved and new conversions was added in Clang-tidy.

So Clang-modernize only takes space and build time without providing
any advantages over Clang-tidy.

Eugene.

+alexfh who was onto that

Back in September I was waiting till the 3.7 release stabilizes, and then just didn’t come back to that. Sent out http://reviews.llvm.org/D15606 now.