[llvm] [llvm][lit] Update regexes in Xunit test (PR #126527)

[David Spickett via llvm-commits]

DavidSpickett wrote:

> could you extend timeout in max-time.py too? It's also failing for me on some very loaded CI machine.

Part of my advice here is to not overload the machine, but I will look at that test. For example if you have multiple CI jobs on the same machine and they all `ninja`, they're going to contend a lot because they don't know each other exists. We had/have this on our shared machines at Linaro.

If I change that test it I'll make a new PR for that.

https://github.com/llvm/llvm-project/pull/126527