Fix a couple of bugs in the way info tables are generated for 64-bit platforms
1. The offset was a full word, but it should actually be a 32-bit offset on 64-bit platforms. 2. The con_desc string was allocated separately, which meant that it might be out of range for a 32-bit offset. These bugs meant that +RTS -Di (interpreter debugging) would sometimes crash on 64-bit.
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