[mono-cecil] Add Instruction to End of Method

[Jeff Nevins]

I guess this is more of an IL instruction but I'd appreciate any help
all the same.

I need to add a method call at the end of an arbitrary set of methods.
The Instructions I'm emitting are fine for most methods - I'm adding
my new Instructions before the last found instruction with a Ret code:

           var returnInstruction =
method.Body.Instructions.LastOrDefault(i => i.OpCode.Code ==
Code.Ret);

....

            foreach (Instruction instruction in exitInstructions)
            {
                processor.InsertBefore(returnInstruction,
instruction);
            }

However, sometimes this approach bombs and I get an Invalid Program
exception, which seems to happen when there is a Br_S instruction
before the Ret instruction....which I guess makes sense.

So, my question is...how can I reliably determine where to insert my
new instruction(s) at the end of the method, before it returns?

Thanks in advance.

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mono-cecil