[lit] Fix Python-3 compatibility, patch by Dan Liew.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@220357 91177308-0d34-0410-b5e6-96231b3b80d8

utils/lit/lit/TestRunner.py

@@ -344,8 +344,8 @@ def parseIntegratedTestScriptCommands(source_path):
         data = f.read()
 
         # Ensure the data ends with a newline.
-        if not data.endswith('\n'):
-            data = data + '\n'
+        if not data.endswith(to_bytes('\n')):
+            data = data + to_bytes('\n')
 
         # Iterate over the matches.
         line_number = 1