certain operations in new integer-gmp are too lazy

This came up in #ghc the other day.

rwbarton@morphism:~$ ghci-7.10.1
GHCi, version 7.10.1: http://www.haskell.org/ghc/  :? for help
Prelude> undefined * 0
0

For consistency not just with Int, but also other integer-* implementations, this should be undefined.

Also affected is for example andInteger.