bors-servo 6d9b2eef29 Auto merge of #26943 - jdm:promise-incumbent, r=Manishearth ...

Fix panic on vimeo.com

The only time we end up enqueuing a promise reaction job with a null incumbent global argument is when SpiderMonkey does some weird stuff behind the scenes for its JS Debugger support (based on https://searchfox.org/mozilla-central/rev/2c1092dc68c63f7bad6da6a03c5883a5ab5ff2ca/js/src/builtin/Promise.cpp#3168). This commit works around that case and adds a regression test so we don't forget about that in the future.

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- [x] `./mach build -d` does not report any errors
- [x] `./mach test-tidy` does not report any errors
- [x] These changes fix #26930
- [x] There are tests for these changes

2020-06-16 20:03:28 -04:00

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