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LLVM will shortly be able to represent variable locations without encoding information into intrinsics -- they'll be stored as DPValue objects instead. We'll still need to be able to llvm-reduce these variable location assignments just like we can with intrinsics today, thus, here's an llvm-reduce pass that enumerates and reduces the DPValue objects. The test for this is paradoxically written with dbg.value intrinsics: this is because we're changing all the core parts of LLVM to support this first, with the textual IR format coming last. Until that arrives, testing the llvm-reduce'ing of DPValues needs the added test using intrinsics. We should be able to drop the variable assignment using %alsoloaded using this method. As with the other llvm-reduce tests, I've got one set of check lines for making the reduction happen as desired, and the other set to check the final output.