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This trivial patch covers a bit of fallout from https://reviews.llvm.org/D153990, where we moved the storage of trailing DPValues into LLVMContext rather than being stored in each block. As a result, you can now get a null DPMarker pointer from the end() iterator where previously you didn't (and now it has to be explicitly created). This is a sort-of stopgap measure -- there's another all-singing all-dancing patch further down the line that refactors all of this so that we don't allocate a DPMarker for every single Instruction. When that lands this will all be refactored so that every time we request a DPMarker, one is created if needs be. That's a performance-fix rather than a functionality related patch though, so it'll come later.
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