[llvm] [StackSafetyAnalysis] Don't call getTruncateOrZeroExtend for pointers of different sizes (PR #79804)

[Nikita Popov via llvm-commits]

https://github.com/nikic approved this pull request.

LGTM as a workaround. I looked over the pass a bit, and it's a real mess.

https://github.com/llvm/llvm-project/pull/79804