[Utils] Hide the default behavior change of D68819 under a flag

With D69701, the options used when running the script on a file will be
recorded and reused on a rerun. This allows us to hide new features
behind flags, starting with the "define" that was introduced in D68819.
diff --git a/llvm/utils/update_cc_test_checks.py b/llvm/utils/update_cc_test_checks.py
index 2e1a190..1697687 100755
--- a/llvm/utils/update_cc_test_checks.py
+++ b/llvm/utils/update_cc_test_checks.py
@@ -187,7 +187,7 @@
   for filename in args.tests:
     with open(filename) as f:
       input_lines = [l.rstrip() for l in f]
-    
+
     first_line = input_lines[0] if input_lines else ""
     if 'autogenerated' in first_line and script_name not in first_line:
       common.warn("Skipping test which wasn't autogenerated by " + script_name, filename)
@@ -298,7 +298,7 @@
             if added:
               output_lines.append('//')
             added.add(mangled)
-            common.add_ir_checks(output_lines, '//', run_list, func_dict, mangled, False)
+            common.add_ir_checks(output_lines, '//', run_list, func_dict, mangled, False, False)
       output_lines.append(line.rstrip('\n'))
 
     # Update the test file.