When converting between int and LargeWord.word avoid doing long precision arithmetic if the high order word is zero.
When converting between int and LargeWord.word avoid doing long precision arithmetic if the high order word is zero.

git-svn-id: 98787b36aaefbae4b30fa755be920954cd25e1e4@982 ae7d391e-3f74-4a2b-a0db-a8776840fd2a

polyml/polyml,mn200/polyml,mn200/polyml,dcjm/polyml,polyml/polyml,polyml/polyml,dcjm/polyml,polyml/polyml,mn200/polyml,mn200/polyml,dcjm/polyml,dcjm/polyml