Revert "Allow empty return statements"
Created by: vchuravy
Reverts JuliaGPU/KernelAbstractions.jl#446
@eschnett
happy to take this on after we figure out the conditional return semantics for the CPU.
Created by: vchuravy
Reverts JuliaGPU/KernelAbstractions.jl#446
@eschnett
happy to take this on after we figure out the conditional return semantics for the CPU.