Add InvalidContext to update_test.py.

This allows the test update script to add 'Invalid Context:' to test
cases. Enable with --check-include=InvalidContext.

llvm-svn: 266322
diff --git a/polly/test/update_check.py b/polly/test/update_check.py
index 7350f54..168f3a9 100644
--- a/polly/test/update_check.py
+++ b/polly/test/update_check.py
@@ -95,6 +95,10 @@
             yield  {'AssumedContext'}
             line = i.__next__()
             yield  {'AssumedContext'}
+        elif line == '    Invalid Context:':
+            yield  {'InvalidContext'}
+            line = i.__next__()
+            yield  {'InvalidContext'}
         elif line == '    Boundary Context:':
             yield  {'BoundaryContext'}
             line = i.__next__()