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9c13067276
After much agonizing, use a full 4 bits of precious MachineOperand space to encode this. This uses existing padding, and doesn't grow MachineOperand beyond its current 32 bytes. This allows tied defs among the first 15 operands on a normal instruction, just like the current MCInstrDesc constraint encoding. Inline assembly needs to be able to tie more than the first 15 operands, and gets special treatment. Tied uses can appear beyond 15 operands, as long as they are tied to a def that's in range. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@163151 91177308-0d34-0410-b5e6-96231b3b80d8
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