optimize semaphore - struct{} has zero size.
optimize semaphore - struct{} has zero size.

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ubin/vitess,guokeno0/vitess,guokeno0/vitess,fengshao0907/vitess,atyenoria/vitess,erzel/vitess,enisoc/vitess,dumbunny/vitess,alainjobart/vitess,ngaut/vitess,anusornc/vitess,rnavarro/vitess,ptomasroos/vitess,dumbunny/vitess,cloudbearings/vitess,anusornc/vitess,tinyspeck/vitess,cgvarela/vitess,fengshao0907/vitess,kmiku7/vitess-annotated,rnavarro/vitess,AndyDiamondstein/vitess,alainjobart/vitess,yangzhongj/vitess,pivanof/vitess,AndyDiamondstein/vitess,kmiku7/vitess-annotated,yaoshengzhe/vitess,enisoc/vitess,atyenoria/vitess,aaijazi/vitess,mapbased/vitess,AndyDiamondstein/vitess,anusornc/vitess,kmiku7/vitess-annotated,davygeek/vitess,HeisenbergUncertain/vitess,tjyang/vitess,tirsen/vitess,skyportsystems/vitess,mapbased/vitess,yangzhongj/vitess,apmichaud/vitess-apm,rnavarro/vitess,fengshao0907/vitess,atyenoria/vitess,mattharden/vitess,netroby/vitess,erzel/vitess,fengshao0907/vitess,sougou/vitess,HubSpot/vitess,erzel/vitess,SDHM/vitess,SDHM/vitess,sougou/vitess