[llvm] [VPlan] Use InstSimplifyFolder in tryToConstantFold (PR #141222)

[Nikita Popov via llvm-commits]

https://github.com/nikic commented:

Can we drop some of the existing simplifications as a result? Like for example https://github.com/llvm/llvm-project/blob/eb6a9b06c619b1844a09dada124a0dd15d6781b3/llvm/lib/Transforms/Vectorize/VPlanTransforms.cpp#L1092.

https://github.com/llvm/llvm-project/pull/141222