[dev.typeparams] cmd/internal/goobj: add duffzero/duffcopy to builtin list

duffzero and duffcopy are commonly referenced functions. Add them
to builtin list, so they are referenced by index, not by name.

Also change gcWriteBarrier to ABIInternal, which is changed in
CL 266638.

Regenerate the file.

Change-Id: If8550d9ed300ac2be930a7c58657a9cf1933ac1d
Reviewed-on: https://go-review.googlesource.com/c/go/+/324250


Trust: Cherry Mui <cherryyz@google.com>
Run-TryBot: Cherry Mui <cherryyz@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Than McIntosh <thanm@google.com>