The call in VRFrameData::LazyCreateMatrix is not needed because
aRetval.set(aArray) ends up calling into Heap::get() which does a read barrier
and exposes.
The call in nsXULPrototypeScript::Compile is not needed because initializing
the AutoJSAPI will guarantee that the global of the Realm it enters, which is
what we're examining here, will be exposed.
The call in Promise's CreateNativeHandlerFunction is not needed because the
object being passed in was always just-created into a stack Rooted.
The call in MIDIMessageEvent::GetData is not needed because it's always working
with a just-created object. Also, mData is a Heap, so there will be a read
barrier anyway before anyone gets at the value.
The call in PrototypeDocumentContentSink::ExecuteScript is not needed because
the AutoEntryScript will guarantee that the global of the Realm it enters is
exposed. And the JSAutoRealm is not needed either, because we're in that Realm
already.
Differential Revision: https://phabricator.services.mozilla.com/D29720
--HG--
extra : moz-landing-system : lando
Boris Zbarsky
Sylvestre Ledru
Jeff Gilbert
Kyle Machulis