go/types: basic Defs/Uses test for aliases
go/types: basic Defs/Uses test for aliases

Change-Id: I113ea712838511ee823375d9ea059089195414f5
Reviewed-on: https://go-review.googlesource.com/32449
Run-TryBot: Robert Griesemer <a6752097faebf1f02d80107d77a9be009089afe3@golang.org>
TryBot-Result: Gobot Gobot <66cb808b70d30c07676d5e946fee83fd561249e5@golang.org>
Reviewed-by: Alan Donovan <7069e9552f9d110b0a0f326b96f22f63fb99dfc1@google.com>

vsekhar/elastic-go,Cofyc/go,josharian/go,codestation/go,Cofyc/go,linux-on-ibm-z/go,goodlang/good,CAFxX/go,suncycheng/go,codestation/go,Cofyc/go,derekmarcotte/go,nawawi/go,polyverse-security/go,suncycheng/go,derekmarcotte/go,derekmarcotte/go,codestation/go,golang/go,CAFxX/go,josharian/go,derekmarcotte/go,nawawi/go,vsekhar/elastic-go,linux-on-ibm-z/go,cloudflare/go,CAFxX/go,akutz/go,goodlang/good,polyverse-security/go,akutz/go,derekmarcotte/go,derekmarcotte/go,suncycheng/go,vsekhar/elastic-go,golang/go,CAFxX/go,akutz/go,Cofyc/go,cloudflare/go,josharian/go,josharian/go,nawawi/go,suncycheng/go,akutz/go,codestation/go,nawawi/go,ImJasonH/go,cloudflare/go,derekmarcotte/go,cloudflare/go,codestation/go,goodlang/good,ImJasonH/go,Cofyc/go,ImJasonH/go,christopher-henderson/Go,golang/go,ImJasonH/go,Cofyc/go,linux-on-ibm-z/go,ImJasonH/go,polyverse-security/go,derekmarcotte/go,goodlang/good,suncycheng/go,ImJasonH/go,goodlang/good,linux-on-ibm-z/go,CAFxX/go,vsekhar/elastic-go,ImJasonH/go,goodlang/good,linux-on-ibm-z/go,cloudflare/go,josharian/go,akutz/go,vsekhar/elastic-go,CAFxX/go,codestation/go,CAFxX/go,Cofyc/go,golang/go,vsekhar/elastic-go,polyverse-security/go,linux-on-ibm-z/go,josharian/go,suncycheng/go,josharian/go,akutz/go,josharian/go,vsekhar/elastic-go,suncycheng/go,codestation/go,polyverse-security/go,golang/go,linux-on-ibm-z/go,golang/go,polyverse-security/go,goodlang/good,polyverse-security/go,nawawi/go,nawawi/go,linux-on-ibm-z/go,goodlang/good,cloudflare/go,akutz/go,golang/go,codestation/go,vsekhar/elastic-go,CAFxX/go,cloudflare/go,nawawi/go,suncycheng/go,polyverse-security/go,akutz/go,Cofyc/go,golang/go,ImJasonH/go,nawawi/go,cloudflare/go