GHC.Cmm.Opt: Handle MO_XX_Conv
This MachOp was introduced by 2c959a18 but a wildcard match in cmmMachOpFoldM hid the fact that it wasn't handled. Ideally we would eliminate the match but this appears to be a larger task.
Fixes #18141 (closed).
This MachOp was introduced by 2c959a18 but a wildcard match in cmmMachOpFoldM hid the fact that it wasn't handled. Ideally we would eliminate the match but this appears to be a larger task.
Fixes #18141 (closed).