Path: add a warning for symbolic stack pointer when adding stack region mapping.
Path: add a warning for symbolic stack pointer when adding stack region mapping.

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