[libclang] Attribute visitation happens out-of-source-order, make sure
we annotate properly when there is an attribute and not skip type specs
if the attribute is after the declaration.

rdar://13129077

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@174689 91177308-0d34-0410-b5e6-96231b3b80d8