[PATCH] [X86][SSE] Avoid scalarization of v2i64 vector shifts

[Simon Pilgrim]

Updated patch based on Andrea's comments - checked against ashr and improved tests


REPOSITORY
  rL LLVM

http://reviews.llvm.org/D8416

Files:
  lib/Target/X86/X86ISelLowering.cpp
  test/CodeGen/X86/vshift-4.ll
  test/CodeGen/X86/x86-shifts.ll

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