Implement PCH support for offsetof(base-specifier).

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@109785 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Frontend/PCHWriterStmt.cpp b/lib/Frontend/PCHWriterStmt.cpp
index e807ddf..eee409b 100644
--- a/lib/Frontend/PCHWriterStmt.cpp
+++ b/lib/Frontend/PCHWriterStmt.cpp
@@ -483,8 +483,7 @@
       break;
         
     case OffsetOfExpr::OffsetOfNode::Base:
-      // FIXME: Implement this!
-      llvm_unreachable("PCH for offsetof(base-specifier) not implemented");
+      Writer.AddCXXBaseSpecifier(*ON.getBase(), Record);
       break;
     }
   }