Add the PCH reader stub for ObjCCompatibleAliasDecl

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@69859 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Frontend/PCHReader.cpp b/lib/Frontend/PCHReader.cpp
index 0791143..72dda6c 100644
--- a/lib/Frontend/PCHReader.cpp
+++ b/lib/Frontend/PCHReader.cpp
@@ -2280,7 +2280,7 @@
   }
   
   case pch::DECL_OBJC_COMPATIBLE_ALIAS: {
-    // FIXME: Implement.
+    D = ObjCCompatibleAliasDecl::Create(Context, 0, SourceLocation(), 0, 0);
     break;
   }