Relax the copy propagation implementation.  Previously, if LHS was modified by the statement then the copy propagation mapping was eliminated.  This is necessary only if the RHS of the mapping is still live (which in most cases it won't be).  If RHS isn't live then the mapping can continue.
Relax the copy propagation implementation.  Previously, if LHS was modified by the statement then the
copy propagation mapping was eliminated.  This is necessary only if the RHS of the mapping is still live
(which in most cases it won't be).  If RHS isn't live then the mapping can continue.

This allows blackscholes to completely fuse again.

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