Disassembly: add a utility function to identify branching instructions.
Disassembly: add a utility function to identify branching instructions.

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