Bug 1760812 - Part 1: Use std::tuple in NativeThenHandler r=smaug,mccr8

Differential Revision: https://phabricator.services.mozilla.com/D141754

dom/promise/Promise-inl.h

@@ -153,7 +153,7 @@ class NativeThenHandler final : public PromiseNativeThenHandlerBase {
                                          JS::Handle<JS::Value> aValue,
                                          ErrorResult& aRv,
                                          std::index_sequence<Indices...>) {
-    return aHandler(aCx, aValue, aRv, ArgType(Get<Indices>(mArgs))...);
+    return aHandler(aCx, aValue, aRv, ArgType(std::get<Indices>(mArgs))...);
   }
 
   template <typename TCallback>
@@ -166,7 +166,7 @@ class NativeThenHandler final : public PromiseNativeThenHandlerBase {
   ResolveCallback mOnResolve;
   RejectCallback mOnReject;
 
-  Tuple<StorageType<Args>...> mArgs;
+  std::tuple<StorageType<Args>...> mArgs;
 };
 
 }  // anonymous namespace

xpcom/base/nsCycleCollectionParticipant.h

@@ -1085,4 +1085,21 @@ inline void ImplCycleCollectionUnlink(JS::Heap<T*>& aField) {
         MOZ_FOR_EACH_EXPAND_HELPER js_members_)                             \
   NS_IMPL_CYCLE_COLLECTION_TRACE_END
 
+template <typename... Elements>
+inline void ImplCycleCollectionUnlink(std::tuple<Elements...>& aField) {
+  std::apply([](auto&&... aArgs) { (ImplCycleCollectionUnlink(aArgs), ...); },
+             aField);
+}
+template <typename... Elements>
+inline void ImplCycleCollectionTraverse(
+    nsCycleCollectionTraversalCallback& aCallback,
+    std::tuple<Elements...>& aField, const char* aName, uint32_t aFlags) {
+  aFlags |= CycleCollectionEdgeNameArrayFlag;
+  std::apply(
+      [&](auto&&... aArgs) {
+        (ImplCycleCollectionTraverse(aCallback, aArgs, aName, aFlags), ...);
+      },
+      aField);
+}
+
 #endif  // nsCycleCollectionParticipant_h__