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refactor[venom]: strengthen an assumption in venom lowering #4715

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this commit strengthens an assumption in venom_to_assembly. due to SSA form, the arguments to phi must be in the predecessor blocks. this means that the def does not reach any use from both branches, except in the case that the use is a phi.

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this commit strengthens an assumption in venom_to_assembly. due to
SSA form, the arguments to phi must be in the predecessor blocks. this
means that the def does not reach any use from both branches, except in
the case that the use is a phi.
@charles-cooper charles-cooper marked this pull request as ready for review July 8, 2025 11:27
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