transmutability: only short-circuit is_transmutable for non-region infers
#149228
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fix #141400, fix #148809
An ICE occurs when using
std::mem::TransmuteFormfor trait resolution when it contains inferred variables. This can be resolved by adding an early return condition tois_transmutable. However, since most existing type resolution appears to be handled byrustc_transmute::TransmuteTypeEnv, we've added a guard that only applies when non-regional inference variables remain.