Fix update-test-checks.py on Python 3.6 (#93116)

re.Match apparently doesn't exist in older versions.

Author: efriedma-quic

llvm/utils/UpdateTestChecks/common.py

@@ -1041,7 +1041,7 @@ def get_value_name(self, var: str, check_prefix: str):
         var = var.replace("-", "_")
         return var.upper()
 
-    def get_affixes_from_match(self, match: re.Match):
+    def get_affixes_from_match(self, match):
         prefix = re.match(self.ir_prefix, match.group(2)).group(0)
         suffix = re.search(self.ir_suffix + "$", match.group(2)).group(0)
         return prefix, suffix