[part 2] Make classes and structures in modules fast-allocated.

Source/modules/webaudio/AudioNodeOutput.h

Index: Source/modules/webaudio/AudioNodeOutput.h
diff --git a/Source/modules/webaudio/AudioNodeOutput.h b/Source/modules/webaudio/AudioNodeOutput.h
index db67e40612a8a67b6130641830a32cbd4d399887..e86f45f49a142a3c82d65891b64754f395f6e323 100644
--- a/Source/modules/webaudio/AudioNodeOutput.h
+++ b/Source/modules/webaudio/AudioNodeOutput.h
@@ -38,6 +38,7 @@ class AudioNodeInput;
 // AudioNodeOutput represents a single output for an AudioNode.
 // It may be connected to one or more AudioNodeInputs.
 class AudioNodeOutput final {
+    WTF_MAKE_FAST_ALLOCATED(AudioNodeOutput);
 public:
     // It's OK to pass 0 for numberOfChannels in which case
     // setNumberOfChannels() must be called later on.