PR27989: only enqueue binary operators into the data recursive int expression
evaluator if they are actually int expressions.

llvm-svn: 271754
diff --git a/clang/test/SemaCXX/constant-expression-cxx1y.cpp b/clang/test/SemaCXX/constant-expression-cxx1y.cpp
index d67cbf6..f810322 100644
--- a/clang/test/SemaCXX/constant-expression-cxx1y.cpp
+++ b/clang/test/SemaCXX/constant-expression-cxx1y.cpp
@@ -949,3 +949,11 @@
 
   static_assert(!f(), "");
 }
+
+namespace PR27989 {
+  constexpr int f(int n) {
+    int a = (n = 1, 0);
+    return n;
+  }
+  static_assert(f(0) == 1, "");
+}