[llvm] [RFC] implement convergence control in MIR using SelectionDAG (PR #71785)

[Sameer Sahasrabuddhe via llvm-commits]

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ssahasra wrote:

Line 342 is where the token operand gets killed on the GLUE node. The GLUE node is the only visible use of the token, because the actual use in READFIRSTLANE is this glue node.

https://github.com/llvm/llvm-project/pull/71785