Fixed a problem in the Clang AST importer where
we overrode debug information as the authoritative
source for type information, substituting types
from the Objective-C runtime.  The runtime should
never be the primary source.

<rdar://problem/16065049>


git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@214583 91177308-0d34-0410-b5e6-96231b3b80d8