[PATCH] Match new shuffle codegen for MOVHPD patterns (PR21791)

[Sanjay Patel]

Hi hfinkel, delena, andreadb, RKSimon,

This patch adds patterns to match SSE (shufpd) and AVX (vpermilpd) shuffle codegen when storing the high element of a v2f64. The existing patterns were only checking for an unpckh type of shuffle. ( http://llvm.org/bugs/show_bug.cgi?id=21791 )

http://reviews.llvm.org/D6586

Files:
  lib/Target/X86/X86InstrSSE.td
  test/CodeGen/X86/extractelement-load.ll
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