[llvm] [LV] Disable fold tail by masking - when induction vars used outside (PR #81609)

[Florian Hahn via llvm-commits]

https://github.com/fhahn commented:

Thanks for the patch!

Could you add the test as a separate PR (with a FIXME); this patch then just adjust the test and the diff shows the change in the test only.

Previously there was a patch shared here https://reviews.llvm.org/D115109 by @rickyz  (hope it's the same as on Phabricator) but the patch never got pushed through. Would be good to look at the comments and potentially pick it up

https://github.com/llvm/llvm-project/pull/81609