sync/atomic: added support for mips64{,le}
sync/atomic: added support for mips64{,le}

Change-Id: Ibe6c345afd4cbae7e2542a350043fbb6b81d5678
Reviewed-on: https://go-review.googlesource.com/14450
Reviewed-by: Minux Ma <72d850dbd8858b791995463d8539b5a379577f28@golang.org>

deft-code/go,ImJasonH/go,theif519/go,miolini/go,binarycrusader/go,momchil-velikov/go,vanloswang/go,theif519/go,Cofyc/go,cloudflare/go,Endika/go,josharian/go,nawawi/go,cyberroadie/go,odeke-em/go,cloudflare/go,akutz/go,ganboing/go-esx,Jordanzuo/go,akutz/go,ganboing/go-esx,momchil-velikov/go,roth1002/go,Cofyc/go,goodlang/good,vsekhar/elastic-go,nawawi/go,kim-racktop/go,vanloswang/go,derekmarcotte/go,Cofyc/go,odeke-em/go,ganboing/go-esx,momchil-velikov/go,4ad/go,polyverse-security/go,miolini/go,roth1002/go,sndnvaps/go,Cofyc/go,suncycheng/go,goodlang/good,Samurais/go,odeke-em/go,nawawi/go,theif519/go,vanloswang/go,rachtsingh/gogojuice,Samurais/go,Cofyc/go,binarycrusader/go,linux-on-ibm-z/go,nawawi/go,CAFxX/go,Endika/go,theif519/go,ganboing/go-esx,ImJasonH/go,Samurais/go,odeke-em/go,deft-code/go,sndnvaps/go,ImJasonH/go,suncycheng/go,Samurais/go,momchil-velikov/go,vsekhar/elastic-go,derekmarcotte/go,linux-on-ibm-z/go,binarycrusader/go,Endika/go,polyverse-security/go,deft-code/go,akutz/go,josharian/go,kim-racktop/go,golang/go,suncycheng/go,linux-on-ibm-z/go,akutz/go,deft-code/go,binarycrusader/go,CAFxX/go,Endika/go,theif519/go,linux-on-ibm-z/go,rachtsingh/gogojuice,mwhudson/go,miolini/go,miolini/go,roth1002/go,fjballest/golang,vanloswang/go,cloudflare/go,momchil-velikov/go,deft-code/go,mwhudson/go,CAFxX/go,golang/go,codestation/go,vsekhar/elastic-go,Jordanzuo/go,suncycheng/go,Cofyc/go,goodlang/good,goodlang/good,golang/go,josharian/go,fjballest/golang,4ad/go,Jordanzuo/go,ImJasonH/go,momchil-velikov/go,4ad/go,golang/go,cyberroadie/go,josharian/go,Endika/go,goodlang/good,deft-code/go,binarycrusader/go,fjballest/golang,polyverse-security/go,vanloswang/go,CAFxX/go,cyberroadie/go,miolini/go,Jordanzuo/go,rachtsingh/gogojuice,codestation/go,mwhudson/go,nawawi/go,sndnvaps/go,fjballest/golang,4ad/go,polyverse-security/go,josharian/go,vanloswang/go,miolini/go,fjballest/golang,vsekhar/elastic-go,linux-on-ibm-z/go,suncycheng/go,polyverse-security/go,cyberroadie/go,Jordanzuo/go,nawawi/go,binarycrusader/go,CAFxX/go,binarycrusader/go,deft-code/go,odeke-em/go,sndnvaps/go,kim-racktop/go,cyberroadie/go,codestation/go,roth1002/go,nawawi/go,suncycheng/go,Jordanzuo/go,Samurais/go,Endika/go,miolini/go,4ad/go,suncycheng/go,codestation/go,mwhudson/go,cloudflare/go,fjballest/golang,mwhudson/go,vsekhar/elastic-go,cyberroadie/go,binarycrusader/go,akutz/go,rachtsingh/gogojuice,Samurais/go,kim-racktop/go,Jordanzuo/go,ImJasonH/go,cyberroadie/go,4ad/go,odeke-em/go,ganboing/go-esx,roth1002/go,linux-on-ibm-z/go,derekmarcotte/go,derekmarcotte/go,polyverse-security/go,golang/go,cyberroadie/go,ImJasonH/go,cloudflare/go,akutz/go,roth1002/go,momchil-velikov/go,Endika/go,goodlang/good,Cofyc/go,momchil-velikov/go,4ad/go,polyverse-security/go,Endika/go,vsekhar/elastic-go,codestation/go,deft-code/go,vanloswang/go,derekmarcotte/go,cloudflare/go,vsekhar/elastic-go,akutz/go,golang/go,CAFxX/go,fjballest/golang,mwhudson/go,sndnvaps/go,CAFxX/go,goodlang/good,miolini/go,rachtsingh/gogojuice,mwhudson/go,josharian/go,christopher-henderson/Go,odeke-em/go,CAFxX/go,vanloswang/go,rachtsingh/gogojuice,Samurais/go,odeke-em/go,suncycheng/go,sndnvaps/go,nawawi/go,fjballest/golang,cloudflare/go,linux-on-ibm-z/go,derekmarcotte/go,Samurais/go,Jordanzuo/go,Cofyc/go,roth1002/go,codestation/go,ganboing/go-esx,polyverse-security/go,golang/go,mwhudson/go,akutz/go,golang/go,josharian/go,rachtsingh/gogojuice,kim-racktop/go,theif519/go,goodlang/good,roth1002/go,ImJasonH/go,ganboing/go-esx,derekmarcotte/go,rachtsingh/gogojuice,linux-on-ibm-z/go,vsekhar/elastic-go,codestation/go,derekmarcotte/go,josharian/go,kim-racktop/go,4ad/go,kim-racktop/go,sndnvaps/go,ganboing/go-esx,theif519/go,codestation/go,sndnvaps/go,theif519/go,kim-racktop/go,cloudflare/go,ImJasonH/go