[dev.power64] cmd/9c: fix endian issue in integer to floating point conversion
[dev.power64] cmd/9c: fix endian issue in integer to floating point conversion

LGTM=rsc
R=rsc, iant
CC=golang-codereviews
https://codereview.appspot.com/129850043

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