Use list_to_bitstring so we don't have to track binaries (#8036)
Use list_to_bitstring so we don't have to track binaries (#8036)

This speeds up comprehensions and remove dialyzer warnings.

Closes #8001
elixir-lang/elixir,pedrosnk/elixir,lexmag/elixir,lexmag/elixir,michalmuskala/elixir,ggcampinho/elixir,kelvinst/elixir,joshprice/elixir,kimshrier/elixir,ggcampinho/elixir,kelvinst/elixir,kimshrier/elixir,pedrosnk/elixir