[fixup][Sema] Allow in C to define tags inside enumerations.
Fix for too aggressive error err_type_defined_in_enum introduced in
r313386. Defining tags inside enumerations is prohibited in C++ but
allowed in C.
Reviewers: aaron.ballman, rnk, doug.gregor
Reviewed By: rnk
Subscribers: alberto_magni, cfe-commits
Differential Revision: https://reviews.llvm.org/D38109
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@313894 91177308-0d34-0410-b5e6-96231b3b80d8
(cherry picked from commit 3069e68753f8bbcd7abcdf2596895b97fa87c43e)
2 files changed
