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[chriswailes]

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.

[chriswailes]

Is there any further work that needs to be done before you can pull this?

[whitequark]

@chriswailes I believe I've ported all your changes: https://github.com/ruby-llvm/ruby-llvm/pull/16