[llvm] [VPlan] Don't fold live ins with both scalar and vector operands (PR #154067)

[Luke Lau via llvm-commits]

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lukel97 wrote:

I gave this a try but I couldn't get it to trigger without -mtriple x86_64. I think it has something to do with how the srem can't be widened on x86 and needs to be replicated instead. I'm not sure if there's an easy way of forcing that on the command line

https://github.com/llvm/llvm-project/pull/154067