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Author SHA1 Message Date
Scott McMurray
363c202581 Stop turning transmutes into discriminants in mir-opt 
Partially reverts 109612, as after 109993 these aren't actually equivalent any more, and I'm no longer confident this was ever an improvement in the first place.
 2023-05-14 11:46:07 -07:00
Ben Kimock
ff855547f4 Rename InstCombine to InstSimplify 2023-05-06 23:22:32 -04:00
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