[llvm] [VPlan] Strip bad TODO in VPTransformState::get (NFC) (PR #166146)

[Luke Lau via llvm-commits]

https://github.com/lukel97 commented:

I presume the point of that TODO is not that it should emit a VPInstruction::Broadcast at that point, but all single scalar values should be wrapped in a VPInstruction::Broadcast before execution. So VPTransformState::get should never have to emit a splat.

https://github.com/llvm/llvm-project/pull/166146