[codegen 1.5] Enable almost all Function-oriented block conversion tests #3610
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Required adding additional passes to the block conversion pipeline in order to clean up unnecessary flow-control logic & registers: 1. a new `RegisterCleanupPass` to remove unused registers and simplify register writes, and 2. a final `DeadCodeEliminationPass` to remove all remaining dead nodes. We also needed a small patch to `FunctionIOLoweringPass` - and a slightly-larger patch to `FlowControlInsertionPass` to avoid maintaining unnecessary flow control logic for a function meant to ignore I/O validity. PiperOrigin-RevId: 848321070
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[codegen 1.5] Enable almost all Function-oriented block conversion tests
Required adding additional passes to the block conversion pipeline in order to clean up unnecessary flow-control logic & registers:
RegisterCleanupPassto remove unused registers and simplify register writes, andDeadCodeEliminationPassto remove all remaining dead nodes.We also needed a small patch to
FunctionIOLoweringPass- and a slightly-larger patch toFlowControlInsertionPassto avoid maintaining unnecessary flow control logic for a function meant to ignore I/O validity.