Index: utils/update_llc_test_checks.py
===================================================================
--- utils/update_llc_test_checks.py
+++ utils/update_llc_test_checks.py
@@ -40,6 +40,8 @@
       '--no_x86_scrub_rip', action='store_false', dest='x86_scrub_rip')
   parser.add_argument('-u', '--update-only', action='store_true',
                       help='Only update test if it was already autogened')
+  parser.add_argument('-du', '--drop-update', action='store_true',
+                      help='Drop and update test checks')
   parser.add_argument('tests', nargs='+')
   args = parser.parse_args()
 
@@ -154,6 +156,9 @@
     output_lines = []
     output_lines.append(autogenerated_note)
 
+    if args.drop_update:
+      input_lines = [l for l in input_lines if not l.startswith((";CHECK", "; CHECK"))]
+    
     for input_line in input_lines:
       if is_in_function_start:
         if input_line == '':