[llvm] [z/OS] Modify regex in error message to match on z/OS. (PR #194020)

[James Henderson via llvm-commits]

jh7370 wrote:

> Hello James @jh7370, sorry if I misunderstood anything. Are you suggesting me to fix those lit tests by adding and using the %errc_ substitutions in lit? Or we haven't decided whether to do it yet? Thanks!

I'm not familiar enough with the lit testsuite setup as to whether it's possible to add it as a substitution that can be used in the tests for lit itself, like with the LLVM tests, sorry. Perhaps @boomanaiden154 can advise. If it is, I think we should add it. I don't think we should add it as a "standard" substitution that is supported for all lit users.

https://github.com/llvm/llvm-project/pull/194020