Make classes and structures in core/inspector fast-allocated.

Source/core/inspector/AsyncCallTracker.h

Index: Source/core/inspector/AsyncCallTracker.h
diff --git a/Source/core/inspector/AsyncCallTracker.h b/Source/core/inspector/AsyncCallTracker.h
index 4a15f1c1b1ed98eef9685fc50b17c7b5e543de6d..f2a4bea62b5311f0d31bc141a6c3b868a7e75657 100644
--- a/Source/core/inspector/AsyncCallTracker.h
+++ b/Source/core/inspector/AsyncCallTracker.h
@@ -55,6 +55,7 @@ class XMLHttpRequest;
 class CORE_EXPORT AsyncCallTracker final : public NoBaseWillBeGarbageCollectedFinalized<AsyncCallTracker>, public V8DebuggerAgent::AsyncCallTrackingListener {
     WTF_MAKE_NONCOPYABLE(AsyncCallTracker);
     WILL_BE_USING_GARBAGE_COLLECTED_MIXIN(AsyncCallTracker);
+    WTF_MAKE_FAST_ALLOCATED_WILL_BE_REMOVED(AsyncCallTracker);
 public:
     AsyncCallTracker(V8DebuggerAgent*, InstrumentingAgents*);
     ~AsyncCallTracker() override;