Disable Web Assembly Memory Checks

Hello Everyone,

I am looking for an option in SpiderMonkey to turn off the bounds check
emitted by JIT compiler while compiling Web Assembly code, something like
"wasm_no_bounds_check" and "wasm_no_stack_checks" in Google V8.
Unfortunately, I couldn't find any such options either using "js --help"
for SpiderMonkey JS Shell version JavaScript-C59.0a1 or "about:config"
options in Mozilla Firefox 57.0.4. Can anyone please help with turning the
checks off, this is required for a research project.

Thank You,

Abhinav Jangda