Index: llvm/utils/lit/lit.py
===================================================================
--- llvm/utils/lit/lit.py
+++ llvm/utils/lit/lit.py
@@ -1,4 +1,7 @@
 #!/usr/bin/env python
+import sys
+
+sys.dont_write_bytecode = True
 
 from lit.main import main
 
Index: llvm/utils/llvm-lit/llvm-lit.in
===================================================================
--- llvm/utils/llvm-lit/llvm-lit.in
+++ llvm/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):