address review feedback

Author: MatzeB

llvm/utils/update_analyze_test_checks.py

@@ -229,4 +229,4 @@ def main():
 
 
 if __name__ == "__main__":
-    main()
+    sys.exit(main())

llvm/utils/update_mca_test_checks.py

@@ -563,11 +563,13 @@ def update_test_file(args, test_path, autogenerated_note):
     )
 
 def main():
+    warnings.showwarning = _showwarning
     script_name = "utils/" + os.path.basename(__file__)
     parser = _get_parser()
     args = common.parse_commandline_args(parser)
     if not args.llvm_mca_binary:
-        raise Error("--llvm-mca-binary value cannot be empty string")
+        stderr.write("Error: --llvm-mca-binary value cannot be empty string\n")
+        return 1
 
     if "llvm-mca" not in os.path.basename(args.llvm_mca_binary):
         _warn("unexpected binary name: {}".format(args.llvm_mca_binary))
@@ -584,9 +586,4 @@ def main():
 
 
 if __name__ == "__main__":
-    try:
-        warnings.showwarning = _showwarning
-        sys.exit(main())
-    except Error as e:
-        sys.stdout.write("error: {}\n".format(e))
-        sys.exit(1)
+    sys.exit(main())