big: add Int methods to act on numbered bits.
Speeds up setting individual bits by ~75%, useful when using big.Int as a bit set. R=gri, rsc CC=golang-dev https://golang.org/cl/4538053
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Speeds up setting individual bits by ~75%, useful when using big.Int as a bit set. R=gri, rsc CC=golang-dev https://golang.org/cl/4538053