cmd/go: compile packages imported by runtime with -+
cmd/go: compile packages imported by runtime with -+

Packages imported by the runtime should follow the same memory
allocation rules as the runtime package.

Change-Id: Id3fadb05605acbd6ac61d7fe6068a2add8bb2308
Reviewed-on: https://go-review.googlesource.com/105995
Run-TryBot: Ian Lance Taylor <87e9c6d529889242b7e184afb632328636553ab4@golang.org>
TryBot-Result: Gobot Gobot <66cb808b70d30c07676d5e946fee83fd561249e5@golang.org>
Reviewed-by: Brad Fitzpatrick <ae9783c0b0efc69cd85ab025ddd17aa44cdc4aa5@golang.org>
Reviewed-by: Keith Randall <8c99c3a9284e493be632950b84cd789d08ed3e9d@golang.org>

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