runtime: add go:noescape declaration for Solaris
runtime: add go:noescape declaration for Solaris

Patch by Rainer Orth.

Change-Id: I6170e64b07d67e59eeec755f70e828a124e8b345
Reviewed-on: https://go-review.googlesource.com/88376
Reviewed-by: Ian Lance Taylor <87e9c6d529889242b7e184afb632328636553ab4@golang.org>

golang/gofrontend,golang/gofrontend,golang/gofrontend,golang/gofrontend