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The main change here is that we're now able to correctly look up plans for these functions. Previously, due to caching, we could end up with one entry covering most of the address space (because part of the function was at the beginning and one at the end). Now, we can correctly recognise that the part in between does not belong to that function, and we can create a different FuncUnwinders instance for it. It doesn't help the discontinuous function much (its plan will still be garbled), but we can at least properly unwind out of the simple functions in between. Fixing the unwind plans for discontinuous functions requires handling each unwind source specially, and this setup allows us to make the transition incrementally.