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...ne and coalesce it into one place. Finally, we can provide a special Twine value which always concatenates to form an empty string -- llvm::Value can return this value when it has no name, and any clients which derive names from this value will automatically avoid doing unused string concatenation, uitostr conversion, etc. As with StringRef, the main price we end up paying is increased complexity and the potential for unsafe memory operations (the Twine is very tied to the ability to keep pointers to memory it doesn't own). The nice part of this API change is that it does not impact the majorit...