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Summary: Currently, MachineVerifier will attempt to verify that tied operands satisfy register constraints as soon as the function is no longer in SSA form. However, PHIElimination will take the function out of SSA form while TwoAddressInstructionPass will actually rewrite tied operands to match the constraints. PHIElimination runs first in the pipeline. Therefore, whenever the MachineVerifier is run after PHIElimination, it will encounter verification errors on any tied operands. This patch adds a function property called TiedOpsRewritten that will be set by TwoAddressInstructionPass and will control when the verifier checks tied operands. Reviewed By: nemanjai Differential Revision: https://reviews.llvm.org/D80538
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