I don't think that says it uses a tracing compiler (naturally the terms are vague in this field, so I'm not certain). Their architecture looks much more like HotSpot than TraceMonkey.
self->hotspot->V8
But, yes, Lars is the man. self->hotspot-> Resilient Smalltalk Embedded Platform ->V8
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.84.7...