Track the size information changes for functions in feldspar-language.
Retire Representation.Kind.
Merge pull request #57 from pjonsson/retire-kind

Retire Representation.Kind.
Merge pull request #58 from pjonsson/arg-sizes

Compiler changes necessary for keeping size information about function arguments in -language

Conflicts:
	lib/Feldspar/Compiler/Imperative/FromCore/Array.hs
	lib/Feldspar/Compiler/Imperative/FromCore/Interpretation.hs