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Here are all of the changes put into individual commits. The issue with the protected method in execution_engine.rb was an unfortunate side effect of me learning git. I thought I had removed that change.
The ibr instruction's optional parameter isn't arbitrary (at least here it isn't): the value is the same default value as found in the C++ API. I've subclassed Instruction and provided a method (and alias) for calling LLVMAddDestination.