I just took a 10-minute-worth look at the directory structure and a couple of source files. One of my conclusions is that the IR has traces of LLVM-inspired constructs; specifically,

• getelementptr. Those of us in the compiler industry know that getelementptr is a very unique feature of LLVM IR, not present in other IR-like representations (e.g. GIMPLE). See DuckDuckGo search for confirmation.
• In the same line, the plain-text notation for IR instructions seems derived from LLVM (see LLVM IR documentation for syntax. This seems to be evident in this comment; also, I could not see dump()-like routines to print text/plain representation from in-memory IR, so these traces seem to only appear in comments
• Use of va_start, va_end, memcpy as IR-level instrinsics (see here (traces) and here (in LLVM IR reference); or here (sources). Again, this seems to be a very strong indicator of something based off LLVM IR design.

Given all the above, and that the LLVM project is under the Apache License v2.0 with LLVM Exceptions, I think this "work" should, at the very least mention (likely in README.md) that underlying LLMs took 'inspiration' from LLVM, and that LLVM is owned by their respective authors / maintainers.

Looking forward to your replies. Also, as time permits, I'll create additional issues for maybe unrelated topics.