We've been JITing using LLVM for a number of years without an obvious problem. It obviously depends on the size of the code you are wanting to JIT, but the OP w

We've been JITing using LLVM for a number of years without an obvious problem. It obviously depends on the size of the code you are wanting to JIT, but the OP was discussing a toy language as a side project, and LLVM is certainly perfect for that use case.