MS ABI: Emit static data members with proper linkage

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@209826 91177308-0d34-0410-b5e6-96231b3b80d8
Sema: Functions with dll attributes cannot be deleted

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@209827 91177308-0d34-0410-b5e6-96231b3b80d8