[llvm] [VPlan] Preserve DT (and SCEV) in VPlan-native path (PR #93287)

[Thorsten Schütt via llvm-commits]

tschuett wrote:

Have you ever considered to build a VPSCEV to decouple from the underlying IR and analysis's? And memory access analysis.

https://github.com/llvm/llvm-project/pull/93287