[PATCH] [SDAG] Make the DAGCombine worklist not grow endlessly due to duplicate insertions.

[Chandler Carruth]

Closed by commit rL213727 (authored by @chandlerc).

REPOSITORY
  rL LLVM

http://reviews.llvm.org/D4616

Files:
  llvm/trunk/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
  llvm/trunk/test/CodeGen/ARM/fold-stack-adjust.ll
  llvm/trunk/test/CodeGen/ARM/sxt_rot.ll
  llvm/trunk/test/CodeGen/PowerPC/complex-return.ll
  llvm/trunk/test/CodeGen/PowerPC/subsumes-pred-regs.ll
  llvm/trunk/test/CodeGen/R600/r600-export-fix.ll
  llvm/trunk/test/CodeGen/R600/swizzle-export.ll
  llvm/trunk/test/CodeGen/Thumb2/thumb2-sxt_rot.ll
  llvm/trunk/test/CodeGen/Thumb2/thumb2-uxt_rot.ll
  llvm/trunk/test/CodeGen/X86/avx512-zext-load-crash.ll
  llvm/trunk/test/CodeGen/X86/block-placement.ll
  llvm/trunk/test/CodeGen/X86/divide-by-constant.ll
  llvm/trunk/test/CodeGen/X86/fold-pcmpeqd-0.ll
  llvm/trunk/test/CodeGen/X86/narrow-shl-load.ll
  llvm/trunk/test/CodeGen/X86/store-narrow.ll
  llvm/trunk/test/CodeGen/X86/vec_extract-sse4.ll
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