CFGFast: Use an AVLTree to implement the _regions for speed concerns.
CFGFast: Use an AVLTree to implement the _regions for speed concerns.

tyb0807/angr,angr/angr,f-prettyland/angr,f-prettyland/angr,tyb0807/angr,chubbymaggie/angr,chubbymaggie/angr,iamahuman/angr,schieb/angr,iamahuman/angr,angr/angr,schieb/angr,chubbymaggie/angr,schieb/angr,iamahuman/angr,angr/angr,tyb0807/angr,f-prettyland/angr