LLVM-IR is not really a standard and it is not backwards compatible across LLVM releases and usually the generated IR is also specific to the target platform. Of course it's still vastly easier recompile already generated IR to a different platform as opposed to writing an emulator but it's not supposed to be used this way.

It's simply not possible to compare LLVM-IR to WASM SPIR-V JVM BEAMVM CLR bytecode.