Implementing jmp_down, jmp_up opcodes.
Implementing jmp_down, jmp_up opcodes.

zherczeg/jerryscript,akosthekiss/jerryscript,dbatyai/jerryscript,slaff/jerryscript,zherczeg/jerryscript,robertsipka/jerryscript,bzsolt/jerryscript,jerryscript-project/jerryscript,grgustaf/jerryscript,LaszloLango/jerryscript,bsdelf/jerryscript,gabrielschulhof/jerryscript,bzsolt/jerryscript,grgustaf/jerryscript,martijnthe/jerryscript,jack60504/jerryscript,glistening/jerryscript,martijnthe/jerryscript,LeeHayun/jerryscript,grgustaf/jerryscript,jerryscript-project/jerryscript,grgustaf/jerryscript,glistening/jerryscript,yichoi/jerryscript,bsdelf/jerryscript,jerryscript-project/jerryscript,robertsipka/jerryscript,bsdelf/jerryscript,akosthekiss/jerryscript,dbatyai/jerryscript,loki04/jerryscript,slaff/jerryscript,bsdelf/jerryscript,glistening/jerryscript,grgustaf/jerryscript,yichoi/jerryscript,jerryscript-project/jerryscript,jack60504/jerryscript,jerryscript-project/jerryscript,LeeHayun/jerryscript,yichoi/jerryscript,slaff/jerryscript,gabrielschulhof/jerryscript,zherczeg/jerryscript,jack60504/jerryscript,tilmannOSG/jerryscript,grgustaf/jerryscript,loki04/jerryscript,slaff/jerryscript,bzsolt/jerryscript,tilmannOSG/jerryscript,martijnthe/jerryscript,martijnthe/jerryscript,martijnthe/jerryscript,akosthekiss/jerryscript,jack60504/jerryscript,bsdelf/jerryscript,tilmannOSG/jerryscript,robertsipka/jerryscript,zherczeg/jerryscript,zherczeg/jerryscript,loki04/jerryscript,martijnthe/jerryscript,akosthekiss/jerryscript,loki04/jerryscript,robertsipka/jerryscript,glistening/jerryscript,LeeHayun/jerryscript,LaszloLango/jerryscript,yichoi/jerryscript,yichoi/jerryscript,bsdelf/jerryscript,LeeHayun/jerryscript,gabrielschulhof/jerryscript,dbatyai/jerryscript,gabrielschulhof/jerryscript,jack60504/jerryscript,bzsolt/jerryscript,tilmannOSG/jerryscript,dbatyai/jerryscript,tilmannOSG/jerryscript,loki04/jerryscript,akosthekiss/jerryscript,jack60504/jerryscript,LaszloLango/jerryscript,slaff/jerryscript,gabrielschulhof/jerryscript,LaszloLango/jerryscript,bzsolt/jerryscript,LaszloLango/jerryscript,glistening/jerryscript,glistening/jerryscript,LeeHayun/jerryscript,dbatyai/jerryscript,loki04/jerryscript,robertsipka/jerryscript,robertsipka/jerryscript