in the tests, println+panic. gofmt some tests too. R=rsc CC=golang-dev https://golang.org/cl/741041
R=rsc, ken2, ken3 https://golang.org/cl/174042
* add runtime sliceslice1 for x[lo:] * remove runtime arraytoslice, rewriting &arr into arr[0:len(arr)]. * port cgen_inline into 8g, 5g. * use native memmove in maps R=ken2 https://golang.org/cl/157106
R=rsc OCL=34041 CL=34041