[PATCH] [Peephole] Advanced rewriting of copies to avoid cross register banks copies.

[Quentin Colombet]

REG_SEQUENCEs are variadic instructions. Thus, we should use MachineInstr::getNumOperands instead of MCInstrDesc::getNumOperands to access the actual number of operands.

http://reviews.llvm.org/D4086

Files:
  lib/CodeGen/PeepholeOptimizer.cpp
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