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FTLJIT is still considered experimental, so although it’s being made available in the OS X port of WebKit by default, it’s not actually turned on yet — it has to be enabled through command-line flags.
Google Chrome’s Blink browser engine was itself a derivative of WebKit, although Google’s V8 engine was an in-house creation. It’s distantly possible Google could also try adapting an LLVM-powered approach to V8 (à la the experiments attempted by JXcore), but all the signs so far show Google committed solidly to V8.
Source: Associated Press