[TazeTSchnitzel]

LLVM IR is unstable, way too big in scope, and not as machine-independent as people think. There have been several efforts to use it as a target-independent high-level bytecode, and they either are very platform-specific single-vendor affairs (Apple) or were retired in favour of a simpler new language that doesn't have its problems (SPIR became SPIR-V, PNaCl became WebAssembly).