lit: Add a forgotten default argument.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@105858 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/utils/lit/lit/TestRunner.py b/utils/lit/lit/TestRunner.py
index c2a6e5b..495badb 100644
--- a/utils/lit/lit/TestRunner.py
+++ b/utils/lit/lit/TestRunner.py
@@ -366,7 +366,7 @@
 
     return True
 
-def parseIntegratedTestScript(test, normalize_slashes):
+def parseIntegratedTestScript(test, normalize_slashes=False):
     """parseIntegratedTestScript - Scan an LLVM/Clang style integrated test
     script and extract the lines to 'RUN' as well as 'XFAIL' and 'XTARGET'
     information. The RUN lines also will have variable substitution performed.