1973206 - Prevent accessing ModuleLoadRequest's mImports to do PrepareBytecodeEncoding

Status: ASSIGNED

(Core :: JavaScript Engine, task, P2)

Description

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

In Bug 1820594, the module graph information won't be available to the host layer.
When a module script is fetched, the host will call LoadRequestedModules or FinishLoadingImportedModule, and the JS engine will iterate the requested modules and call HostLoadImportedModule accordingly.
In that case, I plan to remove the mImports member in ModuleLoadRequest.

But the mImports is iterated before/after the module evaluation.
https://searchfox.org/mozilla-central/rev/158fb9063c06a36e6a2efb2b1823bba8c01e82a1/dom/script/ScriptLoader.cpp#3226
https://searchfox.org/mozilla-central/rev/158fb9063c06a36e6a2efb2b1823bba8c01e82a1/dom/script/ScriptLoader.cpp#3240