[PATCH] [X86] Replace avx2.pbroadcast intrinsics with native IR.

[Ahmed Bougacha]

Hi spatel,

While working on PR23464, the broadcast intrinsics annoyed me.  Let's remove them: it's one of the simplest shuffle kind, IR is good enough.

http://reviews.llvm.org/D10555

Files:
  include/llvm/IR/IntrinsicsX86.td
  lib/IR/AutoUpgrade.cpp
  lib/Target/X86/X86InstrSSE.td
  test/CodeGen/X86/avx2-intrinsics-x86-upgrade.ll
  test/CodeGen/X86/avx2-intrinsics-x86.ll
  test/CodeGen/X86/stack-folding-int-avx2.ll

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