JuliaLang / julia / #37613

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slot2ssa: Fix spurious φᶜ edges (#51199)

The unreachable here seems to be caused by the fact that (as of #50943)
we re-use a more narrow type from Inference that correctly ignores these
edges, but when inserting the `φᶜ` node in `slot2reg` we were including
extra edges that never get exercised at runtime.

I'm not sure _why_ this causes us to hit an unreachable, since the
narrow type from inference is technically still valid (the catch block
will never observe these spurious assignments at runtime), but this
seems to fix the issue and anyway improves the quality of the IRCode
generated by `slot2ssa`.

Resolves #51159

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