DLVMを覗いてみたら、
引用 Update: The authors of this project are no longer maintaining DLVM, but instead developing Swift for TensorFlow, a project providing first-class language and compiler support for machine learning in Swift. Watch the TensorFlow Dev Summit 2018 video for more information.
とありました。メンテナンスしないって、あー、終了ですね。
引用 Designed as a modern compiler infrastructure inspired by LLVM, DLVM is more modular and more generic than existing deep learning compiler frameworks, and supports tensor DSLs with high expressivity. With our prototypical staged DSL embedded in Swift, we argue that the DLVM system enables a form of modular, safe, and performant frameworks for deep learning.
にあるように、DLVMは Swiftベースなんですよね。だから、Swift for TensorFlow に移行したと。。。