cmd/compile: remove unused global variable loophack
cmd/compile: remove unused global variable loophack

Old parser remains.

Change-Id: I05ef1737802e23afc2c2129f58cb66feef8e3425
Reviewed-on: https://go-review.googlesource.com/17244
Reviewed-by: David Crawshaw <a2f0bf29257797dd66800b4fbb9945c3e216c004@golang.org>

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