refactor 'stack' getter into a shared helper used for 'stack', 'lineNumber', and 'fileName'
refactor 'stack' getter into a shared helper used for 'stack', 'lineNumber', and 'fileName'

harold-b/duktape,reqshark/duktape,eddieh/duktape,kphillisjr/duktape,kphillisjr/duktape,zeropool/duktape,kphillisjr/duktape,pombredanne/duktape,nivertech/duktape,sloth4413/duktape,kphillisjr/duktape,haosu1987/duktape,skomski/duktape,skomski/duktape,zeropool/duktape,svaarala/duktape,chenyaqiuqiu/duktape,thurday/duktape,harold-b/duktape,tassmjau/duktape,eddieh/duktape,reqshark/duktape,skomski/duktape,svaarala/duktape,skomski/duktape,sloth4413/duktape,svaarala/duktape,rwaldron/duktape,pombredanne/duktape,nivertech/duktape,thurday/duktape,eddieh/duktape,tassmjau/duktape,skomski/duktape,haosu1987/duktape,haosu1987/duktape,chenyaqiuqiu/duktape,tassmjau/duktape,jmptrader/duktape,haosu1987/duktape,chenyaqiuqiu/duktape,daimajia/duktape,svaarala/duktape,harold-b/duktape,zeropool/duktape,chenyaqiuqiu/duktape,chenyaqiuqiu/duktape,nivertech/duktape,daimajia/duktape,rwaldron/duktape,sloth4413/duktape,reqshark/duktape,skomski/duktape,kphillisjr/duktape,chenyaqiuqiu/duktape,eddieh/duktape,rwaldron/duktape,haosu1987/duktape,zeropool/duktape,zeropool/duktape,markand/duktape,kphillisjr/duktape,jmptrader/duktape,markand/duktape,pombredanne/duktape,daimajia/duktape,thurday/duktape,nivertech/duktape,pombredanne/duktape,reqshark/duktape,nivertech/duktape,harold-b/duktape,eddieh/duktape,daimajia/duktape,nivertech/duktape,reqshark/duktape,tassmjau/duktape,jmptrader/duktape,tassmjau/duktape,kphillisjr/duktape,sloth4413/duktape,kphillisjr/duktape,chenyaqiuqiu/duktape,svaarala/duktape,eddieh/duktape,thurday/duktape,pombredanne/duktape,pombredanne/duktape,haosu1987/duktape,jmptrader/duktape,skomski/duktape,jmptrader/duktape,thurday/duktape,sloth4413/duktape,harold-b/duktape,jmptrader/duktape,kphillisjr/duktape,skomski/duktape,tassmjau/duktape,pombredanne/duktape,thurday/duktape,thurday/duktape,harold-b/duktape,pombredanne/duktape,svaarala/duktape,tassmjau/duktape,zeropool/duktape,chenyaqiuqiu/duktape,markand/duktape,harold-b/duktape,nivertech/duktape,zeropool/duktape,jmptrader/duktape,kphillisjr/duktape,zeropool/duktape,skomski/duktape,haosu1987/duktape,chenyaqiuqiu/duktape,thurday/duktape,harold-b/duktape,eddieh/duktape,zeropool/duktape,eddieh/duktape,jmptrader/duktape,sloth4413/duktape,rwaldron/duktape,haosu1987/duktape,reqshark/duktape,rwaldron/duktape,chenyaqiuqiu/duktape,markand/duktape,jmptrader/duktape,rwaldron/duktape,reqshark/duktape,eddieh/duktape,nivertech/duktape,thurday/duktape,reqshark/duktape,pombredanne/duktape,svaarala/duktape,harold-b/duktape,zeropool/duktape,markand/duktape,sloth4413/duktape,svaarala/duktape,nivertech/duktape,harold-b/duktape,haosu1987/duktape,nivertech/duktape,reqshark/duktape,sloth4413/duktape,markand/duktape,svaarala/duktape,jmptrader/duktape,sloth4413/duktape,markand/duktape,sloth4413/duktape,skomski/duktape,markand/duktape,tassmjau/duktape,reqshark/duktape,haosu1987/duktape,tassmjau/duktape,markand/duktape,daimajia/duktape,daimajia/duktape,eddieh/duktape,pombredanne/duktape,tassmjau/duktape,markand/duktape,thurday/duktape