[llvm] Change update_xxx_checks to continue on error when processing mutliple inputs (PR #137728)

[Scott Linder via llvm-commits]

https://github.com/slinder1 commented:

LGTM, save a couple small differences between tests in the `if __name__ == '__main__'` code

This is something I didn't even realize was a limitation, but I've probably been a little confused by at some points, so thank you for the fix!

https://github.com/llvm/llvm-project/pull/137728