Index: lib/ProfileData/CoverageMapping.cpp
===================================================================
--- lib/ProfileData/CoverageMapping.cpp
+++ lib/ProfileData/CoverageMapping.cpp
@@ -101,9 +101,9 @@
       return;
     const auto &E = Expressions[C.getExpressionID()];
     OS << '(';
-    dump(E.LHS);
+    dump(E.LHS, OS);
     OS << (E.Kind == CounterExpression::Subtract ? " - " : " + ");
-    dump(E.RHS);
+    dump(E.RHS, OS);
     OS << ')';
     break;
   }