R=rsc, iant
CC=golang-dev
https://golang.org/cl/196087
<li>
Method expressions.
<li>
-Support multiple packages with the same name (but different import
-paths) in the same program.
-<li>
Implement goto restrictions.
<li>
Safe compilation mode: generate code which is guaranteed not to obtain
<li>
Method expressions.
<li>
-Support multiple packages with the same name (but different import
-paths) in the same program.
-<li>
Implement goto restrictions.
<li>
Implement garbage collection.