llvm dev - Jul 2019 - Best way to add a new instruction

Hello,
I am pretty new to modifying LLVM, so to get a good understanding I wanted to
try duplicating an already existing instruction (like branch) and give it a new
opcode (so by the end llc will accept an instruction with fbr opcode and produce
the same result as if it was a br instruction). Can I get some guidance on what
will be the best way to add this functionality?

Thank you!
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