Extend DepGraph so it can track "work-products"
A work product right now is just a `.o` file. In the future it probably includes other kinds of files, such as `.bc` files saving the unoptimized LLVM IR. However, because WorkProductIds must be independent of DefIds, so that they don't need translation, this system may not be suitable *as is* for storing fine-grained information (such as the MIR for individual defs), as it was originally intended. We will want to refactor some for that.
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