[dev.regabi] cmd/compile: split out package pkginit [generated]

[git-generate]
cd src/cmd/compile/internal/gc
rf '
	mv fninit Task
	mv init.go initorder.go cmd/compile/internal/pkginit
'

Change-Id: Ie2a924784c7a6fa029eaef821384eef4b262e1af
Reviewed-on: https://go-review.googlesource.com/c/go/+/279479


Trust: Russ Cox <rsc@golang.org>
Run-TryBot: Russ Cox <rsc@golang.org>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>