actually, just check if it is a file (including directory or symlink)

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@211053 91177308-0d34-0410-b5e6-96231b3b80d8

tools/scan-build/scan-build

@@ -208,7 +208,7 @@ sub GetHTMLRunDir {
   }
 
   # Make sure that the directory does not exist in order to avoid hijack.
-  if (-d $NewDir) {
+  if (-e $NewDir) {
       DieDiag("The directory '$NewDir' already exists.\n");
   }