Commit [220651] Maximize Restore History

Handle unbounded integer types in INTEGER-TYPE-NUMERIC-BOUNDS

If any of the integer type in the union lack upper or lower bounds,
immediately abort with unknown bounds (rather than taking the MIN
of NIL and an integer).

Thanks to pfdietz for his random testing.

Fixes lp#1199127.

Paul Khuong Paul Khuong 2013-07-08

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