cmd/compile: eliminate usage of global Fatalf in ssa.go
cmd/compile: eliminate usage of global Fatalf in ssa.go

state and ssafn both have their own Fatalf, so use them instead of
global Fatalf.

Updates #19683

Change-Id: Ie02a961d4285ab0a3f3b8d889a5b498d926ed567
Reviewed-on: https://go-review.googlesource.com/c/go/+/188539
Run-TryBot: Brad Fitzpatrick <ae9783c0b0efc69cd85ab025ddd17aa44cdc4aa5@golang.org>
TryBot-Result: Gobot Gobot <66cb808b70d30c07676d5e946fee83fd561249e5@golang.org>
Reviewed-by: Keith Randall <8c99c3a9284e493be632950b84cd789d08ed3e9d@golang.org>

cloudflare/go,akutz/go,golang/go,golang/go,golang/go,akutz/go,golang/go,nawawi/go,nawawi/go,CAFxX/go,CAFxX/go,akutz/go,CAFxX/go,CAFxX/go,nawawi/go,nawawi/go,cloudflare/go,CAFxX/go,golang/go,cloudflare/go,CAFxX/go,CAFxX/go,nawawi/go,akutz/go,cloudflare/go,nawawi/go,akutz/go,cloudflare/go,nawawi/go,golang/go,cloudflare/go,CAFxX/go,cloudflare/go,cloudflare/go,akutz/go,akutz/go,nawawi/go,golang/go,golang/go,akutz/go