Correct handling invalid filename in llvm-symbolizer

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@183102 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/test/DebugInfo/llvm-symbolizer.test b/test/DebugInfo/llvm-symbolizer.test
index 163bd8e..d094bf9 100644
--- a/test/DebugInfo/llvm-symbolizer.test
+++ b/test/DebugInfo/llvm-symbolizer.test
@@ -23,3 +23,6 @@
 
 CHECK:       _Z3do1v
 CHECK-NEXT: dwarfdump-test3-decl.h:7
+
+RUN: echo "unexisting-file 0x1234" > %t.input2
+RUN: llvm-symbolizer < %t.input2