Is your feature request related to a problem? Please describe.
We previously had some unnecessary logic in the OVM_ExecutionManager that used a returndata of length = 1 to signify a revert in a contract creation. We modified the compiler and safety checker to account for this condition. Since we no longer rely on this logic, I think it's best to remove those changes from the compiler.

Describe the solution you'd like
I would like the 1 byte return data thing to be removed from the compiler and the safety checker. It's confusing to leave this in when it's not needed.