Re-enable FTL JIT #820
Description
#534 appears to no longer be reproducible with latest JavaScriptCore on macOS.
Having FTL JIT enabled again would be good for perf:
cljs.user=> (simple-benchmark [x (range 1e6)] (apply + x) 1e3)
[x (range 1000000)], (apply + x), 1000 runs, 2301 msecs
with it off:
cljs.user=> (simple-benchmark [x (range 1e6)] (apply + x) 1e3)
[x (range 1000000)], (apply + x), 1000 runs, 5426 msecs
It still occurs on Ubuntu 16.04, though:
JSC_useFTLJIT=true planck -D andare:0.7.0 -O simple -e"(require 'cljs.core.async)"
Segmentation fault (core dumped)