jsFunFuzz: warning: no passes specified, not doing any work

[marvi3]

Hello,

I am currently trying to use jsFunFuzz to fuzz-test other JavaScript Interpreters, and I have first tried to do so with mjs.
I have gotten jsFunFuzz to work basically by adding the mjs.fuzzmanagerconf to the folder of the SUT which contains the following:

[Main]
tool = jsfunfuzz
product = mjs
platform = Linux
os = Linux

I also had to comment all occurences of queryBuildConfiguration() inside js_interesting.py.
And mjs is build using the -fsanitize=address flag.

Now it starts when I run:

python3 -m funfuzz.js.loop --random-flags --compare-jit 20 mjs <path to mjs>/build/mjs 

However It gives me the following output:

<path to funfuzz>/wtmp26/w1800-wasm |   0.0s | 0 | fine
warning: no passes specified, not doing any work 

I was not aware, that I need to specify llvm?!?-passes in order to be able make funfuzz working.
What does this mean?