[Modules] Add textual headers for recently added .def files

Keep module.modulemap up to date and get rid of -Wincomplete-umbrella warnings

rdar://problem/35711925

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@319273 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed