1885483 - Provide filename for JSON modules

Status: NEW

(Core :: JavaScript Engine, task, P2)

Description

[Yoshi Cheng-Hao Huang [:allstars.chh][:allstarschh][:yoshi]]

When working on https://phabricator.services.mozilla.com/D202927 I found out that JSON modules doesn't have a filename,
for example, when running the test
https://searchfox.org/mozilla-central/source/js/src/tests/test262/language/import/import-attributes/json-named-bindings.js
I can't get the filename of the JSON module "json-named-bindings_FIXTURE.json"

For normal modules, its ScriptSlot will be initialized in https://searchfox.org/mozilla-central/rev/04f7743d94691fa24212fb43099f9d84c3bfc890/js/src/frontend/Stencil.cpp#2363