PR18044: Reject declarations of enumtype::X early to avoid an assertion in
downstream code.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@195687 91177308-0d34-0410-b5e6-96231b3b80d8
Clang format VS plugin: update build prerequisites in the README

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@195690 91177308-0d34-0410-b5e6-96231b3b80d8