Are there any plans to port LuaJIT to ARM or LLVM? I see a couple of posts mentioning slow FP performance on ARM, but that could be solved with a technique like that used by LNUM.

The LLVM IR is too low level. It loses some context necessary to get the performance of the tailored JIT written by Mike Pall.

There is a separate effort to write a JIT complier for Lua on top of the LLVM, but the performance is not as good as LuaJIT, and reaching such a level will be very complex, (assuming it's possible).

There is sponsorship for a PPC LuaJIT port (targeting embedded systems, I believe) and Mike Pall has expressed interest in an ARM port in the past, but I don't know what the status of that is.

PPC LuaJIT sounds like it would be useful in console games (Why did the big three consoles switch to PPC just as Macs switched to Intel, anyway?).