[PHIElimination] Revert #131837 #146320 #146337#146850

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ronlieb merged 3 commits intomainfrom

users/guy-david/phi-elimination-revert

Jul 3, 2025

Commits on Jul 3, 2025

Revert "[PHIElimination] Verify reappropriated COPY is of similar register class, update livevars. (#146337)"
guy-david
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Revert "[PHIElimination] Fix bug around $noreg assignment (#146320)"
guy-david
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Revert "[PHIElimination] Reuse existing COPY in predecessor basic block (#131837)"
guy-david
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