[tests] Make string encoding issues explicit.

llvm-svn: 188042

clang/test/lit.cfg

@@ -289,6 +289,7 @@ def get_llc_props(tool):
     # Parse the stdout to get the list of registered targets.
     parse_targets = False
     for line in cmd.stdout:
+        line = line.decode('ascii')
         if parse_targets:
             m = re.match( r'(.*) - ', line)
             if m is not None: