Rename objc_lifetime -> objc_ownership, and modify diagnostics to talk about 'ownership', not 'lifetime'.

rdar://9477613.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@133779 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Sema/SemaChecking.cpp b/lib/Sema/SemaChecking.cpp
index 92da37b..6a09bf0 100644
--- a/lib/Sema/SemaChecking.cpp
+++ b/lib/Sema/SemaChecking.cpp
@@ -436,7 +436,7 @@
   case Qualifiers::OCL_Weak:
   case Qualifiers::OCL_Strong:
   case Qualifiers::OCL_Autoreleasing:
-    Diag(DRE->getLocStart(), diag::err_arc_atomic_lifetime)
+    Diag(DRE->getLocStart(), diag::err_arc_atomic_ownership)
       << ValType << FirstArg->getSourceRange();
     return ExprError();
   }