C++0x's deduced auto is illegal in typedefs.

C++0x's deduced auto is illegal in typedefs.

This actually rules out too much, since it also catches typedefs for pointers to functions with trailing return types:

  typedef auto (*F)() -> int;

Fix for that (and the same issue in all abstract-declarators) to follow shortly.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@126153 91177308-0d34-0410-b5e6-96231b3b80d8