Call MaybeBindToTemporary for overloaded binary and unary operators.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@79173 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/AST/Expr.cpp b/lib/AST/Expr.cpp
index b92ecac..fa5ce9f 100644
--- a/lib/AST/Expr.cpp
+++ b/lib/AST/Expr.cpp
@@ -588,6 +588,9 @@
     // effects (e.g. a placement new with an uninitialized POD).
   case CXXDeleteExprClass:
     return false;
+  case CXXBindTemporaryExprClass:
+    return cast<CXXBindTemporaryExpr>(this)
+      ->getSubExpr()->isUnusedResultAWarning(Loc, R1, R2);
   case CXXExprWithTemporariesClass:
     return cast<CXXExprWithTemporaries>(this)
       ->getSubExpr()->isUnusedResultAWarning(Loc, R1, R2);