ParallelIR copy propagation safe list DomainLambda handling
ParallelIR copy propagation safe list DomainLambda handling

Don't remove mapping of DomainLambda escaping variables if they
are in safe list since they can't be changed before the lambda is called.

IntelLabs/ParallelAccelerator.jl,JuliaPackageMirrors/ParallelAccelerator.jl,malekbr/julia-to-tiramisu