[ExecutionEngine] : getting the size of a llvm::Function after MCJIT code generation

Using the MCJIT compiler, in the execution engine I can get the address of a function generated by the JIT compiler (with ExecutionEngine::getFunctionAddress), but I can’t find a method which can give me the llvm::Function size in memory. Is there a way to get this information ?
Thanks!

object::computeSymbolSizes