Return false if we encounter a type we can't handle.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@59889 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/AST/ExprConstant.cpp b/lib/AST/ExprConstant.cpp
index 5c5adb6..6fba884 100644
--- a/lib/AST/ExprConstant.cpp
+++ b/lib/AST/ExprConstant.cpp
@@ -1176,7 +1176,8 @@
   } else if (getType()->isComplexType()) {
     if (!EvaluateComplexFloat(this, Result, Info))
       return false;
-  }    
+  }  else
+    return false;
 
   if (isEvaluated)
     *isEvaluated = Info.isEvaluated;