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
@@ -3,15 +3,15 @@
 import os
 import sys
 
+sys.dont_write_bytecode = True
+
 config_map = {}
 
 def map_config(source_dir, site_config):
     global config_map
-    source_dir = os.path.realpath(source_dir)
-    source_dir = os.path.normpath(source_dir)
-    source_dir = os.path.normcase(source_dir)
+    source_inode = os.stat(source_dir).st_ino
     site_config = os.path.normpath(site_config)
-    config_map[source_dir] = site_config
+    config_map[source_inode] = site_config
 
 # Variables configured at build time.
 llvm_source_root = "@LLVM_SOURCE_DIR@"