[llvm] [SCEV] Fix infinite recursion in getZeroExtendExpr via missing Depth propagation (PR #184958)

[via llvm-commits]

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dean-mccoppin wrote:

You're right, the test was written by hand without being able to verify it triggers the crash — I'll need to obtain the actual IR from the crash reproducer. Could you share what the IR looks like at the point of crash, or should I try to reproduce it by running the original C input through the full -O3 pipeline to get the IR that reaches LSR?

https://github.com/llvm/llvm-project/pull/184958