Make -Wunused-value off by default, matching GCC. Fixes rdar://7126194.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@114316 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/test/SemaCXX/overloaded-operator.cpp b/test/SemaCXX/overloaded-operator.cpp
index a33ea5d..09e0a5f 100644
--- a/test/SemaCXX/overloaded-operator.cpp
+++ b/test/SemaCXX/overloaded-operator.cpp
@@ -157,7 +157,7 @@
 
 void test_comma(X x, Y y) {
   bool& b1 = (x, y);
-  X& xr = (x, x); // expected-warning {{expression result unused}}
+  X& xr = (x, x);
 }
 
 struct Callable {