bug#56680: go-1.16.15 build fails in check phase on powerpc64le

[Marcel van der Boom]

[Efraim Flashner]:
> [...]
> just removing the native-inputs field completely from 1.17 
> should try to
> make go-1.17 build with gccgo. Then try to build go@1.17.

That does indeed start a gccgo build and fails after a while with 
this:
( https://dpaste.org/3UwS2 has more details)


starting phase `build'
Building Go cmd/dist using 
/gnu/store/imii98jzv6jhgyk4k6mkagyhksjwn0rr-gccgo-10.3.0. (go1.14.6 
gccgo (GCC) 10.3.0 linux/ppc64le)
Building Go toolchain1 using 
/gnu/store/imii98jzv6jhgyk4k6mkagyhksjwn0rr-gccgo-10.3.0.
Building Go bootstrap cmd/go (go_bootstrap) using Go toolchain1.

/tmp/guix-build-go-1.17.11.drv-0/source/src/internal/abi/abi.go:37:7: 
internal compiler error: '(*RegArgs).Dump': nil register for 
value: v13 = SelectN <mem> [0] v12