Fix values being misclassified as immediate xrefs
Fix values being misclassified as immediate xrefs

* jmp's are ignored

* some displacement might appear to be immediates when they are actually displacements (i.e. in a lea)

chubbymaggie/mcsema,trailofbits/mcsema,trailofbits/mcsema,chubbymaggie/mcsema,trailofbits/mcsema,chubbymaggie/mcsema,chubbymaggie/mcsema,trailofbits/mcsema