Revert commits that caused a stack overflow on Mac#6067

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catamorphism wants to merge 2 commits intorust-lang:incomingfrom

catamorphism:revert

Commits on Apr 25, 2013

Revert libcore: unify `gen_<type>` methods on `rand::RngUtil` into the generic `gen`.
catamorphism
committed
Revert "libcore: remove unnecessary deref"
catamorphism
committed