[llvm] [VPlan] Add initial loop-invariant code motion transform. (PR #107894)

[Florian Hahn via llvm-commits]

fhahn wrote:

> LGTM, modulo pending test updates.

Thanks, all tests should be passing now. Had to add an extra check to disallow hoisting Allocas, similar to https://github.com/llvm/llvm-project/blob/main/llvm/lib/Transforms/Scalar/LICM.cpp#L1112

https://github.com/llvm/llvm-project/pull/107894