Fix js backtrace attached to ocaml exn #1409
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Fix #1347
Fix #1045
One can control backtrace recording with OCAMLRUNPARAM env variable
$ OCAMLRUNPARAM=b=0 node ./q.js 12 Fatal error: exception Not_found $ OCAMLRUNPARAM=b=1 node ./q.js 12 Fatal error: exception Not_found /js_of_ocaml/q.js:1474 if(err.js_error) throw err.js_error; ^ Error: Js exception containing backtrace at caml_exn_with_js_backtrace (/js_of_ocaml/q.js:31:21) at caml_maybe_attach_backtrace (/js_of_ocaml/q.js:36:15) at f (/js_of_ocaml/q.js:1560:25) at f (/js_of_ocaml/q.js:1563:15) at f (/js_of_ocaml/q.js:1563:15) at /js_of_ocaml/q.js:1566:12 at Object.<anonymous> (/js_of_ocaml/q.js:1574:3) at Module._compile (node:internal/modules/cjs/loader:1101:14) at Object.Module._extensions..js (node:internal/modules/cjs/loader:1153:10) at Module.load (node:internal/modules/cjs/loader:981:32)