[PATCH] Add DAG combine for shl + add of constants.

[Matt Arsenault]

Remove redundant transform in visitADD, add more tests

http://reviews.llvm.org/D4768

Files:
  lib/CodeGen/SelectionDAG/DAGCombiner.cpp
  test/CodeGen/AArch64/arm64-shifted-sext.ll
  test/CodeGen/R600/shl_add_constant.ll
  test/CodeGen/R600/shl_add_ptr.ll
  test/CodeGen/R600/trunc.ll
  test/CodeGen/X86/add_shl_constant.ll
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