Adding debug output to investigate systemz bot issue.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@297531 91177308-0d34-0410-b5e6-96231b3b80d8

unittests/Basic/VirtualFileSystemTest.cpp

@@ -436,6 +436,7 @@ TEST(VirtualFileSystemTest, BrokenSymlinkRealFSRecursiveIteration) {
       EC = std::error_code();
       continue;
     } else if (EC) {
+      outs() << "BrokenSymlinkRealFSRecursiveIteration EC: " << EC.message();
       break;
     }
     Contents.push_back(I->getName());