[llvm] [InstCombine] Collect users iteratively (PR #131956)

[Anshil Gandhi via llvm-commits]

gandhi56 wrote:

Yes, my apologies. The root cause of the bug I am working on is elsewhere and this PR is not sufficiently related to the solution. I would certainly like this PR implemented in instcombine at some point, however there seems are certain gaps that need to be addressed.

https://github.com/llvm/llvm-project/pull/131956