import changes from `dev' branch of rmottola/Arctic-Fox:

- Bug 1204027 - Rejigger export-parsing code to make a subsequent change simpler. r=arai (af4ec6b65e)
- Bug 1204027 - Forbid escapes within keywords when parsing/tokenizing. r=arai (200badac56)
- Bug 1204027 - Followup to fix a hazard, and (conveniently enough) to also make a minor cleanup enabled by the fix. r=bustage (9fb514a7a2)
- Bug 1204857 - Report an error if there's trailing garbage after parsing a module r=efaust (515f5e315e)
- Bug 1168091 - Initialize startLine and startColumn members in FunctionBox constructor, r=jorendorff. (61e1c71710)
- Bug 1206750 - Don't assert when |export ... from 'str'| is followed by a regular expression literal on a new line, with no intervening semicolon. r=arai (2d1eb977f7)
- Bug 1206980 - Separate MatchOrInsertSemicolon into 2 functions for after expression and non-expression. r=Waldo (086dce51eb)
- Bug 1022369 - Correctly execute |Function("var x\n/regex/g")| without throwing a SyntaxError. r=Waldo (7cdd72425f)
- Micro-fix to the parser for a linking issue that *seemingly* should affect everyone, yet hasn't produced any complaints I'm aware of yet. No bug, r=me for a trivial refactoring that evades the problem (3f4380fbfe)
- bit of Bug 1167029 - Remove support for let blocks - matches TFF (24599beb85)
- Bug 1187062 - Part 1: Add the JS::ubi::StackFrame interface; r=sfink (2f9107cdce)
- Bug 1187062 - Part 2: Implement a concrete JS::ubi::StackFrame class backed by js::SavedFrame; r=sfink (68a4a5f232)
- Bug 1187062 - Part 3: Add jsapi-tests for JS::ubi::StackFrame; r=sfink (9439163007)
- Bug 1194424 - Part 1: Serialize JS::ubi::StackFrame allocation stacks into core dumps; r=sfink (51d59a2770)
- Bug 1194424 - Part 2: Deserialize JS::ubi::StackFrame allocation stacks from core dumps; r=sfink (b65d1490aa)
- Bug 1194426 - Add sourceLength and functionDisplayNameLength to JS::ubi::StackFrame. r=sfink (52d7aeb35d)
- Bug 1194424 - Part 3: Implement a concrete JS::ubi::StackFrame specialization backed by a frame deserialized from a core dump; r=sfink (1a7854a393)
- Bug 1194424 - Part 5: gtest for DeserializedStackFrame ubi::StackFrames; r=sfink (2fb1d5b9e2)
- Bug 1203297 - Fix even more unified bustage; r=efaust (ce837cd0fe)
- Bug 1155923 - Add Deprecated attribute to interfaces, r=peterv (a05d3a97c1)
- Bug 1209325: Move implementation of JS WeakMap type into its own file. r=terrence. (a992e4670e)
- Bug 1175394 part 2 - Rename normal/strict arguments to mapped/unmapped arguments. r=jorendorff (ee2fae5832)
- Bug 1054756, part 5 - Remove Class::convert. (3b27b97e69)
- js/irregexp: HACK: undefining `min` and `max` when building with MSVC, fix build (5c249ce4)
- js: more exporting for fixing shared mozjs build (43705277)

js/src/jsarray.cpp

@@ -3307,7 +3307,6 @@ const Class ArrayObject::class_ = {
     nullptr, /* enumerate */
     nullptr, /* resolve */
     nullptr, /* mayResolve */
-    nullptr, /* convert */
     nullptr, /* finalize */
     nullptr, /* call */
     nullptr, /* hasInstance */