Add new checker-specific attribute 'objc_ownership_returns'. This isn't hooked

up to the checker yet, but essentially it allows a user to specify that an
Objective-C method or C function returns an owned an Objective-C object.

llvm-svn: 70001

clang/lib/Frontend/PCHReader.cpp

@@ -3045,6 +3045,7 @@ Attr *PCHReader::ReadAttributes() {
 
     SIMPLE_ATTR(ObjCException);
     SIMPLE_ATTR(ObjCNSObject);
+    SIMPLE_ATTR(ObjCOwnershipReturns);
     SIMPLE_ATTR(Overloadable);
     UNSIGNED_ATTR(Packed);
     SIMPLE_ATTR(Pure);