[PATCH] D118459: [ISEL] Canonicalize STEP_VECTOR to LHS if RHS is a splat.

[Sander de Smalen via Phabricator via llvm-commits]

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This helps recognise patterns where we're trying to match STEP_VECTOR
patterns to INDEX instructions that take a GPR for the Start/Step.

The reason for canonicalising this operation to the LHS is
because it will already be canonicalised to the LHS if the RHS
is a constant splat vector.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D118459

Files:
  llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
  llvm/test/CodeGen/AArch64/active_lane_mask.ll
  llvm/test/CodeGen/AArch64/sve-stepvector.ll

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