[PATCH] [X86, AVX] adjust tablegen patterns to generate better code for scalar insertion into zero vector (PR23073)

[Sanjay Patel]

Patch updated again: the old patterns were commented out rather than deleted in the last rev.


http://reviews.llvm.org/D8794

Files:
  lib/Target/X86/X86InstrSSE.td
  test/CodeGen/X86/vector-shuffle-256-v4.ll
  test/CodeGen/X86/vector-shuffle-256-v8.ll

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