issue-511: recognise rex.w jmpq *<literal>(%rip) as iat jump
issue-511: recognise rex.w jmpq *<literal>(%rip) as iat jump

Apparently Windows Server 2012 (and presumably windows 8) now has this
form of iat jump. Which is quite useless (rex.w is according to my
understanding is not needed at all) but because of rex.w our code to
recognize jumps like that didn't work.

Fix is just skip this prefix.



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