Bug 1176096 - Ensure we don't do self-moves in move assignment (r=bent)

ipc/glue/MessageChannel.cpp

@@ -161,7 +161,7 @@ public:
 
     InterruptFrame& operator=(InterruptFrame&& aOther)
     {
-        MOZ_ASSERT(&aOther != this);
+        MOZ_RELEASE_ASSERT(&aOther != this);
         this->~InterruptFrame();
         new (this) InterruptFrame(mozilla::Move(aOther));
         return *this;