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

[via llvm-commits]

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)


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