Objective-C. Update my previous patch to not warn if
+initialize is called on 'super' in its implementation.
rdar://16628028


git-svn-id: http://llvm.org/svn/llvm-project/cfe/trunk@216282 91177308-0d34-0410-b5e6-96231b3b80d8
Ignore -Wunsupported-dll-base-class-template by default

The situation it is warning about (see PR20725) is not very likely
to be a real problem, and it is unclear what action the user should take
if the warning does fire.

git-svn-id: http://llvm.org/svn/llvm-project/cfe/trunk@216283 91177308-0d34-0410-b5e6-96231b3b80d8