Depending on specific optimization settings VS2013 will sometimes
execute the operands to
new Instruction(builder.getUniqueId(), builder.makeBoolType(), OpPhi)
left-to-right, and sometimes right-to-left. Since makeBoolType can
also call getUniqueId(), the IDs to the OpPhi can sometimes be swapped.
This guarantees an explicit ordering of the Ids so that tests work
reliably.
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