[PATCH] [X86] replace vinsertf128 intrinsics with generic shuffles

[Sanjay Patel]

Patch updated:

1. Mask off all but the low bit of the immediate
2. Added test case to confirm masking


http://reviews.llvm.org/D8086

Files:
  include/llvm/IR/IntrinsicsX86.td
  lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
  lib/IR/AutoUpgrade.cpp
  test/CodeGen/X86/avx-intrinsics-x86-upgrade.ll
  test/CodeGen/X86/avx-intrinsics-x86.ll
  test/CodeGen/X86/avx-vinsertf128.ll
  test/CodeGen/X86/unaligned-32-byte-memops.ll

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