First featured in Self many years ago, done by the same folks (Lars Bak and crew) who brought you V8. Then Sun bought their Smalltalk/Self-based company, and they built HotSpot for the JVM. Then Google hired them to do the same for Javascript, and now we have V8.
It generally takes about 10-20 years to get truly new ideas from the labs to consumer-level products.
Neither Self nor HotSpot uses tracing. It's a relatively new compilation technique, the implementation in the original tracing paper used java bytecode as the source language.
I think you are confusing tracing with adaptive compilation.
It generally takes about 10-20 years to get truly new ideas from the labs to consumer-level products.