[PATCH] [X86][SSE] Vectorized i8 and i16 shift operators

[Simon Pilgrim]

Thanks Elena, I've committed the AVX2 i16 shift lowering in http://reviews.llvm.org/rL238149. Updated this patch with just the pre-AVX2 lowering patterns.


REPOSITORY
  rL LLVM

http://reviews.llvm.org/D9474

Files:
  lib/Target/X86/X86ISelLowering.cpp
  lib/Target/X86/X86TargetTransformInfo.cpp
  test/Analysis/CostModel/X86/testshiftashr.ll
  test/Analysis/CostModel/X86/testshiftlshr.ll
  test/Analysis/CostModel/X86/testshiftshl.ll
  test/CodeGen/X86/2011-12-15-vec_shift.ll
  test/CodeGen/X86/avx2-vector-shifts.ll
  test/CodeGen/X86/vec_shift8.ll

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