Make lit stop writing pyc files.

Many svn-based buildbots seem to be getting stuck continually
in tree conflicts due to the output of pyc files.  I'm disabling
these as a temporary measure in an attempt to get everything
stable again.

I'll try to remove this code once I understand the problem
better.

llvm-svn: 313698

utils/lit/lit.py

@@ -1,4 +1,7 @@
 #!/usr/bin/env python
+import sys
+
+sys.dont_write_bytecode = True
 
 from lit.main import main
 

utils/llvm-lit/llvm-lit.in

@@ -3,6 +3,8 @@
 import os
 import sys
 
+sys.dont_write_bytecode = True
+
 config_map = {}
 
 def map_config(source_dir, site_config):