Scott McMurray f20af8d43d Simplify transmutes in MIR InstCombine
Thanks to the combination of #108246 and #108442 it could already remove identity transmutes.

With this PR, it can also simplify them to `IntToInt` casts, `Discriminant` reads, or `Field` projections.
2023-03-28 18:18:10 -07:00
..
2023-03-27 13:48:38 +02:00
2023-03-27 18:58:07 +00:00