clang-modernize: Instantiate llvm::Registry<TransformFactory>.

git-svn-id: https://llvm.org/svn/llvm-project/clang-tools-extra/trunk@212270 91177308-0d34-0410-b5e6-96231b3b80d8
clang-tidy: Instantiate llvm::Registry<clang::tidy::ClangTidyModule>.

git-svn-id: https://llvm.org/svn/llvm-project/clang-tools-extra/trunk@212271 91177308-0d34-0410-b5e6-96231b3b80d8