[PATCH] Optimize sext/zext insertion algorithm in back-end

[Jiangning Liu]

Patch is updated following feedbacks.

http://reviews.llvm.org/D5257

Files:
  include/llvm/CodeGen/FunctionLoweringInfo.h
  lib/CodeGen/SelectionDAG/FunctionLoweringInfo.cpp
  lib/CodeGen/SelectionDAG/LegalizeIntegerTypes.cpp
  lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
  test/CodeGen/AArch64/atomic-ops.ll
  test/CodeGen/AArch64/rm_redundant_cmp.ll
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