<rdar://problem/13459871> Allow forward declaration of enums with a fixed underlying type in Objective-C (as well as C++11).



git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@177930 91177308-0d34-0410-b5e6-96231b3b80d8
For printf checking, handle nested typedefs for darwin-specific checking.

Fixes <rdar://problem/13491605>.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@177931 91177308-0d34-0410-b5e6-96231b3b80d8