[llvm] [VPlan] Compute cost of more replicating loads/stores in ::computeCost. (PR #160053)

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ronlieb wrote:

> > reduced to smaller ll, attached, ~ 77 lines rename reduced.txt to reduced.ll opt -O3 reduced.ll [reduced.txt](https://github.com/user-attachments/files/23442032/reduced.txt)
> 
> Thanks for sharing the reproducer. Are there any additional flags needed? I cannot reproduce the crash on current main: https://llvm.godbolt.org/z/T3W4cYf7v

sorry for missing this , email filters.   i think it was simply -O3 

https://github.com/llvm/llvm-project/pull/160053