ARM: avoid handing a deleted node back to TableGen during ISel. When we replaced the multiplicand the destination node might already exist. When that happens the original gets CSEd and deleted. However, it's actually used as the offset so nonsense is produced. Should fix PR32726. This fixes an assertion failure when building building www/firefox 53.0 for arm. Reported by: Bob Prohaska PR: 218782 MFC after: 3 days
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