[PATCH] Add intrinsics and SDNodes for signed/unsigned absolute difference (absdiff) and horizontal add (hadd).

[Shahid]

Hi hfinkel, jmolloy, rengolin,

This adds new intrinsics "*absdiff" and "*hadd" to facilitate the efficient code generation for "sum of absolute differences" operation.

The patch also contains the introduction of corresponding SDNodes and basic legalization support

An RFC discussion could be found at below link
https://groups.google.com/forum/#!topic/llvm-dev/S3P1Sh3H--Q

REPOSITORY
  rL LLVM

http://reviews.llvm.org/D10273

Files:
  docs/LangRef.rst
  include/llvm/CodeGen/ISDOpcodes.h
  include/llvm/IR/Intrinsics.td
  include/llvm/Target/TargetSelectionDAG.td
  lib/CodeGen/SelectionDAG/LegalizeDAG.cpp
  lib/CodeGen/SelectionDAG/LegalizeIntegerTypes.cpp
  lib/CodeGen/SelectionDAG/LegalizeTypes.h
  lib/CodeGen/SelectionDAG/LegalizeVectorOps.cpp
  lib/CodeGen/SelectionDAG/LegalizeVectorTypes.cpp
  lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
  lib/CodeGen/SelectionDAG/SelectionDAGDumper.cpp
  lib/CodeGen/TargetLoweringBase.cpp
  lib/Target/X86/X86ISelDAGToDAG.cpp
  lib/Target/X86/X86ISelLowering.cpp
  lib/Target/X86/X86ISelLowering.h
  test/CodeGen/X86/absdiff_intrinsic.ll
  test/CodeGen/X86/hadd_intrinsic.ll

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