[llvm] [lit] Support wildcard in --xfail-not option (PR #151191)

[Mircea Trofin via llvm-commits]

mtrofin wrote:

> > Since we're just interested in profile consistency on the upcoming bot, ignoring `FileCheck` is simpler and sufficient. However, this has the effect of passing XFAIL tests. Rather than listing them all, the alternative is to just ignore passing XFAIL.
> 
> So there are no XFAIL tests that are failing because of a non-zero exit status of a command (e.g., opt, diff, grep)? That is, simply avoiding FileCheck invocations is enough to make all XFAIL tests start to pass? If not, then `--xfail-not=*` will expose those test failures.

IIUC you're saying it's possible that when turning `--xfail-not=*` and profcheck, some of the resulting failures aren't due to profcheck (either now or in the future). That's fine - we can piecemeal mark those tests as unsupported when profcheck is enabled.

https://github.com/llvm/llvm-project/pull/151191