Changes in 20210426094327

Built from 289e41464376d19099608543d46ca3d3697c839d

..index..
Bug 1696085 R[Core:JavaScript Engine]Use js::EnumFlags for js::ObjLiteralFlags
Bug 1706404 N[Core:JavaScript Engine]Change all Get(Own)PropertyDescriptor callers to using Maybe<PropertyDescriptor>
Bug 1705280 A[Core:Panning and Zooming]Overscroll handoff doesn't work on overflow:hidden OOP iframe documents
Bug 1700051 N[Core:Spelling checker]Reduce accessbility of `mozInlineSpellStatus`'s members
Bug 1689101 N[DevTools:Console]Intermittent devtools/client/webconsole/test/browser/browser_webconsole_network_messages_expand_before_updates.js | Uncaught exception - at chrome://mochitests/content/browser/devtools/client/shared/test/shared-head.js:700 - Error: Failed waitFor():
Bug 1702922 R[Firefox Build System:Lint and Formatting]Perma [tier 2] tools/lint/test/test_clippy.py::test_basic[clippy] | test_file_and_path_provided[clippy] TEST-UNEXPECTED-FAIL
Bug 1706073 R[WebExtensions:Request Handling]Add unit tests to verify load behavior for moz-extension requests with SRI
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Changes to 7 bugs - 3 fixed.