[PATCH] [SDAG] Introduce a combined set to the DAG combiner which tracks nodes which have successfully round-tripped through the combine phase, and use this to ensure all operands to DAG nodes are visited by the combiner, even if they are only added...

[Chandler Carruth]

Closed by commit rL213898 (authored by @chandlerc).

REPOSITORY
  rL LLVM

http://reviews.llvm.org/D4638

Files:
  llvm/trunk/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
  llvm/trunk/test/CodeGen/AArch64/arm64-dagcombiner-indexed-load.ll
  llvm/trunk/test/CodeGen/ARM/aapcs-hfa-code.ll
  llvm/trunk/test/CodeGen/Mips/cmov.ll
  llvm/trunk/test/CodeGen/R600/add_i64.ll
  llvm/trunk/test/CodeGen/R600/or.ll
  llvm/trunk/test/CodeGen/X86/2010-04-23-mmx-movdq2q.ll
  llvm/trunk/test/CodeGen/X86/i8-umulo.ll
  llvm/trunk/test/CodeGen/X86/jump_sign.ll
  llvm/trunk/test/CodeGen/X86/lower-bitcast.ll
  llvm/trunk/test/CodeGen/X86/pr15267.ll
  llvm/trunk/test/CodeGen/X86/store-narrow.ll
  llvm/trunk/test/CodeGen/X86/trunc-ext-ld-st.ll
  llvm/trunk/test/CodeGen/X86/vector-idiv.ll
  llvm/trunk/test/CodeGen/X86/widen_cast-1.ll
  llvm/trunk/test/CodeGen/X86/widen_conv-1.ll
  llvm/trunk/test/CodeGen/X86/widen_load-2.ll
  llvm/trunk/test/CodeGen/X86/x86-64-tls-1.ll
  llvm/trunk/test/CodeGen/X86/x86-setcc-int-to-fp-combine.ll
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