Fix the rewriter, rdar://10234024.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@141201 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Sema/SemaDeclObjC.cpp b/lib/Sema/SemaDeclObjC.cpp
index c1c000e..de48de1 100644
--- a/lib/Sema/SemaDeclObjC.cpp
+++ b/lib/Sema/SemaDeclObjC.cpp
@@ -586,7 +586,8 @@
             ProtocolName, ProtocolLoc, PDecl->getLocation(), PList);
 
     // Make sure the cached decl gets a valid start location.
-    PDecl->setLocation(AtProtoInterfaceLoc);
+    PDecl->setAtStartLoc(AtProtoInterfaceLoc);
+    PDecl->setLocation(ProtocolLoc);
     PDecl->setForwardDecl(false);
     // Since this ObjCProtocolDecl was created by a forward declaration,
     // we now add it to the DeclContext since it wasn't added before