cmd/compile: fix TODO in tracing code
cmd/compile: fix TODO in tracing code

For #13243.

Change-Id: I214945278255a49f93120f9407f536a6c01a29fb
Reviewed-on: https://go-review.googlesource.com/17101
Reviewed-by: Chris Manghane <fe04d2e6759ff872548dffaa0000d96c00597e75@golang.org>

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