cmd/compile: change two pushedio.bin tests to use importpkg instead
cmd/compile: change two pushedio.bin tests to use importpkg instead

pushedio.bin and importpkg are both non-nil iff we're parsing an
package's export data, so "pushedio.bin == nil" and "importpkg == nil"
are equivalent tests.

Change-Id: I571ee908fef867117ef72c5da1eb24fe9b3fd12d
Reviewed-on: https://go-review.googlesource.com/19751
Reviewed-by: Robert Griesemer <a6752097faebf1f02d80107d77a9be009089afe3@golang.org>

cloudflare/go,nawawi/go,4ad/go,codestation/go,cloudflare/go,akutz/go,cloudflare/go,suncycheng/go,suncycheng/go,nawawi/go,mwhudson/go,golang/go,suncycheng/go,vanloswang/go,josharian/go,polyverse-security/go,ImJasonH/go,vanloswang/go,derekmarcotte/go,linux-on-ibm-z/go,vsekhar/elastic-go,vanloswang/go,momchil-velikov/go,ganboing/go-esx,momchil-velikov/go,ganboing/go-esx,CAFxX/go,polyverse-security/go,goodlang/good,codestation/go,codestation/go,vsekhar/elastic-go,vanloswang/go,vanloswang/go,akutz/go,4ad/go,CAFxX/go,golang/go,josharian/go,miolini/go,mwhudson/go,codestation/go,josharian/go,akutz/go,josharian/go,ImJasonH/go,vsekhar/elastic-go,ImJasonH/go,josharian/go,cloudflare/go,momchil-velikov/go,akutz/go,CAFxX/go,vsekhar/elastic-go,suncycheng/go,goodlang/good,nawawi/go,momchil-velikov/go,goodlang/good,vsekhar/elastic-go,miolini/go,theif519/go,mwhudson/go,derekmarcotte/go,mwhudson/go,theif519/go,goodlang/good,4ad/go,Samurais/go,ganboing/go-esx,nawawi/go,ImJasonH/go,momchil-velikov/go,linux-on-ibm-z/go,Cofyc/go,4ad/go,golang/go,Samurais/go,polyverse-security/go,vanloswang/go,ganboing/go-esx,binarycrusader/go,miolini/go,Cofyc/go,ganboing/go-esx,ganboing/go-esx,vsekhar/elastic-go,vanloswang/go,momchil-velikov/go,vsekhar/elastic-go,josharian/go,linux-on-ibm-z/go,codestation/go,CAFxX/go,codestation/go,4ad/go,josharian/go,binarycrusader/go,goodlang/good,binarycrusader/go,ganboing/go-esx,derekmarcotte/go,CAFxX/go,polyverse-security/go,golang/go,cloudflare/go,goodlang/good,derekmarcotte/go,CAFxX/go,theif519/go,linux-on-ibm-z/go,goodlang/good,Samurais/go,nawawi/go,golang/go,polyverse-security/go,momchil-velikov/go,goodlang/good,miolini/go,akutz/go,theif519/go,ImJasonH/go,Samurais/go,polyverse-security/go,Samurais/go,derekmarcotte/go,polyverse-security/go,Samurais/go,mwhudson/go,suncycheng/go,derekmarcotte/go,Cofyc/go,suncycheng/go,vsekhar/elastic-go,miolini/go,Cofyc/go,derekmarcotte/go,christopher-henderson/Go,golang/go,CAFxX/go,codestation/go,binarycrusader/go,Samurais/go,ImJasonH/go,nawawi/go,mwhudson/go,golang/go,ImJasonH/go,suncycheng/go,linux-on-ibm-z/go,linux-on-ibm-z/go,miolini/go,miolini/go,akutz/go,4ad/go,polyverse-security/go,Cofyc/go,codestation/go,Cofyc/go,suncycheng/go,theif519/go,cloudflare/go,derekmarcotte/go,binarycrusader/go,miolini/go,Cofyc/go,mwhudson/go,josharian/go,golang/go,nawawi/go,ImJasonH/go,CAFxX/go,vanloswang/go,mwhudson/go,cloudflare/go,linux-on-ibm-z/go,momchil-velikov/go,binarycrusader/go,4ad/go,binarycrusader/go,akutz/go,Cofyc/go,4ad/go,ganboing/go-esx,theif519/go,nawawi/go,linux-on-ibm-z/go,theif519/go,akutz/go,cloudflare/go,binarycrusader/go,Samurais/go,theif519/go