cmd/compile: aggregate some rules in AMD64.rules
cmd/compile: aggregate some rules in AMD64.rules

No changes in the generated file, as expected.

Change-Id: I30e0404612cd150f1455378b8db1c18b1e12d34e
Reviewed-on: https://go-review.googlesource.com/95616
Reviewed-by: Brad Fitzpatrick <ae9783c0b0efc69cd85ab025ddd17aa44cdc4aa5@golang.org>

codestation/go,cloudflare/go,josharian/go,Cofyc/go,cloudflare/go,josharian/go,Cofyc/go,CAFxX/go,akutz/go,codestation/go,nawawi/go,Cofyc/go,golang/go,golang/go,nawawi/go,akutz/go,golang/go,golang/go,josharian/go,codestation/go,akutz/go,josharian/go,codestation/go,josharian/go,golang/go,codestation/go,cloudflare/go,codestation/go,nawawi/go,Cofyc/go,akutz/go,golang/go,cloudflare/go,nawawi/go,CAFxX/go,CAFxX/go,nawawi/go,golang/go,nawawi/go,cloudflare/go,akutz/go,cloudflare/go,Cofyc/go,codestation/go,akutz/go,CAFxX/go,Cofyc/go,CAFxX/go,akutz/go,CAFxX/go,josharian/go,codestation/go,CAFxX/go,CAFxX/go,nawawi/go,josharian/go,cloudflare/go,Cofyc/go,Cofyc/go,golang/go,akutz/go,josharian/go,nawawi/go,cloudflare/go