cmd/compile: Budget for inlining is now 80 nodes, not 40
cmd/compile: Budget for inlining is now 80 nodes, not 40

This comment was out of date since the bump to 80 done as the same time
as inlining transitive functions in:

  commit 77ccb16eb12f461eaea5fdf652a2e929dc154192
  Author: Russ Cox <rsc@golang.org>
  Date:   Tue Feb 24 12:19:01 2015 -0500

      cmd/internal/gc: transitive inlining

Adjust the comment at the top of the file accordingly.

Change-Id: Ia6d7397c874e3b85396e82dc9678e56aab9ad728
Reviewed-on: https://go-review.googlesource.com/40910
Reviewed-by: Brad Fitzpatrick <ae9783c0b0efc69cd85ab025ddd17aa44cdc4aa5@golang.org>

akutz/go,cloudflare/go,golang/go,nawawi/go,cloudflare/go,polyverse-security/go,polyverse-security/go,vsekhar/elastic-go,nawawi/go,cloudflare/go,Cofyc/go,codestation/go,josharian/go,Cofyc/go,vsekhar/elastic-go,cloudflare/go,CAFxX/go,nawawi/go,cloudflare/go,vsekhar/elastic-go,derekmarcotte/go,josharian/go,CAFxX/go,ImJasonH/go,ImJasonH/go,ImJasonH/go,golang/go,codestation/go,derekmarcotte/go,Cofyc/go,ImJasonH/go,derekmarcotte/go,akutz/go,golang/go,nawawi/go,akutz/go,josharian/go,nawawi/go,christopher-henderson/Go,ImJasonH/go,josharian/go,CAFxX/go,josharian/go,akutz/go,CAFxX/go,polyverse-security/go,vsekhar/elastic-go,akutz/go,polyverse-security/go,vsekhar/elastic-go,Cofyc/go,codestation/go,golang/go,CAFxX/go,polyverse-security/go,Cofyc/go,golang/go,CAFxX/go,derekmarcotte/go,derekmarcotte/go,akutz/go,josharian/go,ImJasonH/go,polyverse-security/go,golang/go,nawawi/go,CAFxX/go,golang/go,Cofyc/go,derekmarcotte/go,CAFxX/go,cloudflare/go,polyverse-security/go,josharian/go,codestation/go,derekmarcotte/go,cloudflare/go,cloudflare/go,vsekhar/elastic-go,codestation/go,ImJasonH/go,vsekhar/elastic-go,codestation/go,akutz/go,codestation/go,josharian/go,nawawi/go,derekmarcotte/go,ImJasonH/go,nawawi/go,vsekhar/elastic-go,Cofyc/go,akutz/go,Cofyc/go,codestation/go,polyverse-security/go,golang/go