WaitSynch: Removed unused variables and reduced SharedPtr copies.

Define a variable with the value of the sync timeout error code.

Use a boost::flat_map instead of an unordered_map to hold the equivalence of objects and wait indices in a WaitSynchN call.

src/citra_qt/debugger/wait_tree.cpp

@@ -230,7 +230,7 @@ std::vector<std::unique_ptr<WaitTreeItem>> WaitTreeThread::GetChildren() const {
         list.push_back(std::make_unique<WaitTreeMutexList>(thread.held_mutexes));
     }
     if (thread.status == THREADSTATUS_WAIT_SYNCH) {
-        list.push_back(std::make_unique<WaitTreeObjectList>(thread.wait_objects, thread.IsWaitingAll()));
+        list.push_back(std::make_unique<WaitTreeObjectList>(thread.wait_objects, thread.IsSleepingOnWaitAll()));
     }
 
     return list;