[llvm] update_test_checks: keep meta variables stable by default (PR #76748)

[Nicolai Hähnle via llvm-commits]

nhaehnle wrote:

Thanks for taking another look.

Removing the inner recursion changes the outcome of one of the test cases, but not in a way that seems relevant to me in terms of quality. So I'm going to remove it to keep things a bit simpler.

And yes, with the outer recursion we don't have a near-linear time guarantee anymore. It's probably okay in this case?

https://github.com/llvm/llvm-project/pull/76748