[all-commits] [llvm/llvm-project] de65b3: [VectorCombine] add/use pass-level IRBuilder

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  Branch: refs/heads/master
  Home:   https://github.com/llvm/llvm-project
  Commit: de65b356dc2d9730b02ac21dd308cdc3ced0feac
      https://github.com/llvm/llvm-project/commit/de65b356dc2d9730b02ac21dd308cdc3ced0feac
  Author: Sanjay Patel <spatel at rotateright.com>
  Date:   2020-06-22 (Mon, 22 Jun 2020)

  Changed paths:
    M llvm/lib/Transforms/Vectorize/VectorCombine.cpp
    M llvm/test/Transforms/PhaseOrdering/X86/vector-reductions.ll
    M llvm/test/Transforms/VectorCombine/X86/extract-binop.ll

  Log Message:
  -----------
  [VectorCombine] add/use pass-level IRBuilder

This saves creating/destroying a builder every time we
perform some transform.

The tests show instruction ordering diffs resulting from
always inserting at the root instruction now, but those
should be benign.