Don't mark a type specifier as "owned" if there is no declaration to own.

This simplifies error recovery elsewhere, eliminating the crash in
<rdar://problem/13853540>.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@181846 91177308-0d34-0410-b5e6-96231b3b80d8
Objective-C [diagnostics] [QOI], when method is not
found for a receiver, note where receiver class
is declaraed (this is most common when receiver is a forward
class). // rdar://3258331


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@181847 91177308-0d34-0410-b5e6-96231b3b80d8
Add static_cast to assertion to silence sign/unsigned comparison warning.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@181849 91177308-0d34-0410-b5e6-96231b3b80d8
Unbreaking the MSVC build by adding an include.  It broke with r181832.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@181853 91177308-0d34-0410-b5e6-96231b3b80d8