Fix an off-by-one in cfloat.
Fix an off-by-one in cfloat.

It didn't correctly handle 0 or range(2**63, 2**64).

This does not affect previous results because they did not use the
affected numbers.

UIKit0/HyperDex,rescrv/HyperDex,tempbottle/HyperDex,UIKit0/HyperDex,tempbottle/HyperDex,vashstorm/HyperDex,tempbottle/HyperDex,hyc/HyperDex,pombredanne/HyperDex,vashstorm/HyperDex,pombredanne/HyperDex,pombredanne/HyperDex,UIKit0/HyperDex,tempbottle/HyperDex,cactorium/HyperDex,cactorium/HyperDex,pombredanne/HyperDex,rescrv/HyperDex,hyc/HyperDex,rescrv/HyperDex,cactorium/HyperDex,rescrv/HyperDex,vashstorm/HyperDex,vashstorm/HyperDex,jtk54/HyperDex,jtk54/HyperDex,cactorium/HyperDex,UIKit0/HyperDex,jtk54/HyperDex,jtk54/HyperDex,cactorium/HyperDex,jtk54/HyperDex,hyc/HyperDex,UIKit0/HyperDex,vashstorm/HyperDex,rescrv/HyperDex,rescrv/HyperDex,tempbottle/HyperDex,jtk54/HyperDex,cactorium/HyperDex,tempbottle/HyperDex,cactorium/HyperDex,hyc/HyperDex,pombredanne/HyperDex,rescrv/HyperDex,vashstorm/HyperDex,rescrv/HyperDex,jtk54/HyperDex,cactorium/HyperDex,hyc/HyperDex,tempbottle/HyperDex,cactorium/HyperDex,UIKit0/HyperDex,tempbottle/HyperDex,vashstorm/HyperDex,rescrv/HyperDex,jtk54/HyperDex,vashstorm/HyperDex,pombredanne/HyperDex,tempbottle/HyperDex,hyc/HyperDex,hyc/HyperDex,UIKit0/HyperDex,UIKit0/HyperDex,pombredanne/HyperDex,jtk54/HyperDex,pombredanne/HyperDex,UIKit0/HyperDex,pombredanne/HyperDex,vashstorm/HyperDex,hyc/HyperDex