[llvm] Limit Number of Values used for SCEV Calculation (PR #140565)

[Manish Kausik H via llvm-commits]

Nirhar wrote:

I did some more study as to why the crash happens in the IR file that I have locally. It seems that while we calculate SCEV, we try to `StrengthenNoWrap` flags on SCEV Values, and that process is implemented recursively. For the IR file in question, we  have a long chain of Values that are considered for strengthening recursively, and this exhausts the stack. 

A better solution would be to iteratively compute NoWrap flag strengthening. I'll try and come up with a patch for that. The solution in this MR is not a good solution. Hence closing this PR.

https://github.com/llvm/llvm-project/pull/140565