[dev.power64] cmd/9l/9.out.h: introduce NFREG, REGG, REGRT1 and REGRT2
[dev.power64] cmd/9l/9.out.h: introduce NFREG, REGG, REGRT1 and REGRT2

LGTM=rsc
R=rsc, iant
CC=golang-codereviews
https://codereview.appspot.com/125990043

webfd/go-zh,bryanxu/go-zh,webfd/go-zh,webfd/go-zh,d0f/go-zh,bryanxu/go-zh,webfd/go-zh,d0f/go-zh,d0f/go-zh,webfd/go-zh,bryanxu/go-zh,bryanxu/go-zh,bryanxu/go-zh,d0f/go-zh,bryanxu/go-zh,d0f/go-zh,bryanxu/go-zh,d0f/go-zh,d0f/go-zh,webfd/go-zh,bryanxu/go-zh,d0f/go-zh,webfd/go-zh,webfd/go-zh