Only generate depth-first list once per method in flow analyzer
Only generate depth-first list once per method in flow analyzer

Improves performance.

spidermonkdust/vala,themiwi/vala,Jc2k/vala,Jc2k/vala,spidermonkdust/vala,severinh/vala,xdave/pvala,severinh/vala,themiwi/vala,jessevdk/vala,flobrosch/vala-fixes,frida/vala,rvu95/vala,Distrotech/vala,spidermonkdust/vala,jessevdk/vala,themiwi/vala,frida/vala,frida/vala,GNOME/vala,GNOME/vala,GNOME/vala,frida/vala,severinh/vala,kamanashisroy/aroop,tjol/vala-tjol,flobrosch/vala-fixes,kamanashisroy/aroop,jessevdk/vala,Distrotech/vala,kamanashisroy/aroop,phako/vala,frida/vala,tjol/vala-tjol,Distrotech/vala,playya/vala,playya/vala,GNOME/vala,playya/vala,phako/vala,rvu95/vala,tjol/vala-tjol,flobrosch/vala-fixes,rvu95/vala