py/objfun: Remove unnecessary check for viper fun with 5 or more args.
py/objfun: Remove unnecessary check for viper fun with 5 or more args.

The native emitter/compiler restricts viper functions to 4 args, so there
is no need for an extra check in the dynamic dispatch.

bvernoux/micropython,dmazzella/micropython,micropython/micropython-esp32,tuc-osg/micropython,TDAbboud/micropython,selste/micropython,TDAbboud/micropython,swegener/micropython,jmarcelino/pycom-micropython,puuu/micropython,selste/micropython,tuc-osg/micropython,micropython/micropython-esp32,adafruit/micropython,adafruit/micropython,hosaka/micropython,infinnovation/micropython,ryannathans/micropython,hosaka/micropython,matthewelse/micropython,matthewelse/micropython,mhoffma/micropython,torwag/micropython,mhoffma/micropython,hiway/micropython,pozetroninc/micropython,tobbad/micropython,trezor/micropython,pfalcon/micropython,Peetz0r/micropython-esp32,tuc-osg/micropython,blazewicz/micropython,AriZuu/micropython,puuu/micropython,SHA2017-badge/micropython-esp32,Peetz0r/micropython-esp32,MrSurly/micropython,oopy/micropython,blazewicz/micropython,henriknelson/micropython,hiway/micropython,SHA2017-badge/micropython-esp32,Timmenem/micropython,puuu/micropython,deshipu/micropython,PappaPeppar/micropython,MrSurly/micropython-esp32,dxxb/micropython,SHA2017-badge/micropython-esp32,tuc-osg/micropython,alex-robbins/micropython,alex-march/micropython,turbinenreiter/micropython,alex-march/micropython,tuc-osg/micropython,pramasoul/micropython,adafruit/circuitpython,chrisdearman/micropython,tobbad/micropython,toolmacher/micropython,hiway/micropython,trezor/micropython,adafruit/circuitpython,bvernoux/micropython,alex-march/micropython,toolmacher/micropython,Peetz0r/micropython-esp32,kerneltask/micropython,matthewelse/micropython,mhoffma/micropython,turbinenreiter/micropython,MrSurly/micropython,tralamazza/micropython,puuu/micropython,cwyark/micropython,ryannathans/micropython,hiway/micropython,ryannathans/micropython,mhoffma/micropython,deshipu/micropython,matthewelse/micropython,henriknelson/micropython,dxxb/micropython,ryannathans/micropython,turbinenreiter/micropython,lowRISC/micropython,pfalcon/micropython,alex-march/micropython,toolmacher/micropython,hosaka/micropython,toolmacher/micropython,tobbad/micropython,PappaPeppar/micropython,lowRISC/micropython,HenrikSolver/micropython,alex-march/micropython,cwyark/micropython,MrSurly/micropython,oopy/micropython,oopy/micropython,jmarcelino/pycom-micropython,deshipu/micropython,chrisdearman/micropython,matthewelse/micropython,lowRISC/micropython,jmarcelino/pycom-micropython,adafruit/circuitpython,blazewicz/micropython,MrSurly/micropython-esp32,dxxb/micropython,kerneltask/micropython,HenrikSolver/micropython,blazewicz/micropython,infinnovation/micropython,tralamazza/micropython,adafruit/micropython,mhoffma/micropython,pfalcon/micropython,pramasoul/micropython,Peetz0r/micropython-esp32,deshipu/micropython,dmazzella/micropython,selste/micropython,SHA2017-badge/micropython-esp32,henriknelson/micropython,turbinenreiter/micropython,tobbad/micropython,torwag/micropython,alex-robbins/micropython,micropython/micropython-esp32,pozetroninc/micropython,lowRISC/micropython,cwyark/micropython,torwag/micropython,dxxb/micropython,swegener/micropython,TDAbboud/micropython,Peetz0r/micropython-esp32,oopy/micropython,MrSurly/micropython,cwyark/micropython,Timmenem/micropython,deshipu/micropython,cwyark/micropython,kerneltask/micropython,pramasoul/micropython,MrSurly/micropython,infinnovation/micropython,swegener/micropython,turbinenreiter/micropython,pfalcon/micropython,pozetroninc/micropython,PappaPeppar/micropython,pozetroninc/micropython,lowRISC/micropython,selste/micropython,tobbad/micropython,dmazzella/micropython,chrisdearman/micropython,torwag/micropython,kerneltask/micropython,trezor/micropython,Timmenem/micropython,AriZuu/micropython,AriZuu/micropython,AriZuu/micropython,adafruit/micropython,Timmenem/micropython,jmarcelino/pycom-micropython,kerneltask/micropython,hosaka/micropython,bvernoux/micropython,adafruit/circuitpython,adafruit/circuitpython,TDAbboud/micropython,torwag/micropython,hosaka/micropython,ryannathans/micropython,blazewicz/micropython,PappaPeppar/micropython,pramasoul/micropython,bvernoux/micropython,adafruit/circuitpython,toolmacher/micropython,matthewelse/micropython,dmazzella/micropython,MrSurly/micropython-esp32,trezor/micropython,pramasoul/micropython,pfalcon/micropython,chrisdearman/micropython,MrSurly/micropython-esp32,TDAbboud/micropython,alex-robbins/micropython,PappaPeppar/micropython,Timmenem/micropython,HenrikSolver/micropython,trezor/micropython,chrisdearman/micropython,henriknelson/micropython,tralamazza/micropython,jmarcelino/pycom-micropython,alex-robbins/micropython,selste/micropython,oopy/micropython,tralamazza/micropython,micropython/micropython-esp32,bvernoux/micropython,HenrikSolver/micropython,dxxb/micropython,micropython/micropython-esp32,MrSurly/micropython-esp32,alex-robbins/micropython,infinnovation/micropython,swegener/micropython,swegener/micropython,henriknelson/micropython,hiway/micropython,adafruit/micropython,infinnovation/micropython,puuu/micropython,AriZuu/micropython,SHA2017-badge/micropython-esp32,pozetroninc/micropython,HenrikSolver/micropython