Allow trivially constructible return types for ThOr functors
Currently in this test only float, int and bool (and the SIMDWrapper counterparts) are allowed as return types of functors.
This should be changed to allow all trivially constructible return types (e.g. enum). Currently the above test segfaults when this is enabled. See e.g. the TRACKHISTORY functor here to be enabled here
Connected to !2645 (merged)