A small step towards cleaner separation of the different translation stages.
This merely removes
concretetype as an attribute of
Constant and creates a subclass
rpython.rtyper.rmodel.LLConstant which still accepts it. Also adds to
rpython.rtyper.rmodel the following utility function, which had already been implemented 3 times in random places:
def ll_const(obj): return LLConstant(obj, typeOf(obj))