Perhaps it's not an advantage, but it certainly is not a disadvantage. An advantage that I can think of is portability as well as easier interfacing with C libraries.
Almost all systems that matter have an LLVM port these days, so portability isn't really an issue in practice (though sometimes C can help with microcontrollers, etc.) Game consoles in particular are all x86 or PPC these days. Easier interfacing with C libraries is a fair point, although you still have to figure out how the two languages' type systems interact and presenting good error messages can be a pain if you're relying on the C compiler to do semantic analysis.
I disagree to optimisation, but agree to portability.
It's difference of 100% and 99%, but sometimes the 1% can be significant. And of course, it also can be insignificant.