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

- Bug 1236321 - Annotate intentional switch fallthroughs to suppress -Wimplicit-fallthrough warnings in js/. r=luke (32d46328ef)
- Bug 1236552 - Odin: handle unfinished AsmJSModuleObject in addSizeOfMisc (r=bbouvier) (dafbd77b10)
- Bug 1229399: Make writing the IR fallible, provide a fallible readingAPI; r=luke (cbc536c3fa)
- Bug 1237272 - Only for Coverity - check arg1, arg2 and arg3 for validity. r=luke (1456e58951)
- Bug 1229399: Split FuncIR into Bytecode/Encoder/Decoder/FuncBytecode; r=luke (9f438b4d5f)
- Bug 1237508 - Odin: make AsmJSModule derive wasm::Module (r=bbouvier) (0186bf908b)
- Bug 1238195 - Switch over some AutoVectorRooters to Rooted<TraceableVector>s and fill in some missing support (r=terrence) (b556fdc27e)
- Bug 1234193 - IsRelazifiableFunction: Return false when we report an error. r=jandem (bd3c33e1e6)
- Bug 1221361: Mark SetARMHwCapFlags as unsafe for fuzzing; r=jolesen (3134febc32)
- Bug 1236564 - Fix various minor issues with getting/setting GC parameters r=terrence (45e251eba7)
- Bug 1235237 - Annotate intentional switch fallthrough to suppress -Wimplicit-fallthrough warning in storage/. r=mak (f81714fdab)
- Bug 1235236 - Annotate intentional switch fallthrough to suppress -Wimplicit-fallthrough warning in modules/libjar/. r=aklotz (f3a210802b)
- Bug 1236324 - Annotate intentional switch fallthroughs to suppress -Wimplicit-fallthrough warnings in toolkit/components/places/. r=mak (f2d09b5041)
- Bug 1238711 - Rename TraceableVector to GCVector; r=sfink Bug 1237153 - Fix gcparam() parameter verification to not allow negative numbers r=terrence (deccfd7f01)
- Bug 1235092 - Part 1: Optimize spread call with rest parameter. r=efaust (e6cc1294d1)
- Bug 1235092 - Part 2: Support allowContentSpread in the optimization for spread call with rest parameter. r=efaust (31c881893d)
- Bug 1235092 - Part 3: Root function in BytecodeEmitter::isRestParameter. r=bustage (ede37f48b6)
- Bug 1233152 - Use PersistentRooted for ParseTask script and sourceObject. r=terrence (d99d9b81fb)
- Bug 1236476: Report out of memory in ExpandErrorArgumentsVA; r=jandem (6a2327222c)
- Bug 1239601 - improve the UniquePtr situation (r=jorendorff) (640322c8c1)
- Bug 1239724: Introduce RegExp registers to non-ion builds; r=arai (f2d837e65b)
- Bug 1137624 - Remove ArrayJoin code duplication, and use a correct alias set. r=jandem (ab8a98a5e3)
- Bug 1237284: Make SIMD names more consistent in MCallOptimize; r=jolesen (d50f74a31e)
- Bug 1238582 - Fix spurious assertion failure in array sort due to over-eager OOM simulation r=jandem (587f4976e5)
- Bug 1235874 - handle null filename in DescribeScriptedCaller (r=sunfish) (b347469108)
- Bug 1239601 - improve the UniquePtr situation (r=jandem) (a8b9f15dcb)

dom/base/WebSocket.cpp

@@ -1261,7 +1261,7 @@ WebSocket::Constructor(const GlobalObject& aGlobal,
     }
 
     unsigned lineno, column;
-    JS::AutoFilename file;
+    JS::UniqueChars file;
     if (!JS::DescribeScriptedCaller(aGlobal.Context(), &file, &lineno,
                                     &column)) {
       NS_WARNING("Failed to get line number and filename in workers.");
@@ -1496,7 +1496,7 @@ WebSocketImpl::Init(JSContext* aCx,
     MOZ_ASSERT(aCx);
 
     unsigned lineno, column;
-    JS::AutoFilename file;
+    JS::UniqueChars file;
     if (JS::DescribeScriptedCaller(aCx, &file, &lineno, &column)) {
       mScriptFile = file.get();
       mScriptLine = lineno;