0310f7f2d0
We can convert this to a select based on the `(icmp eq X, C)`, then
constant fold the addition the true arm begin `(add C, (sext/zext 1))`
and the false arm being `(add X, 0)` e.g
- `(select (icmp eq X, C), (add C, (sext/zext 1)), (add X, 0))`.
This is essentially a specialization of the only case that sees to
actually show up from #89020
Closes #93840
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