Wouldn't they want to eventually use LLVM to compile Asm.js anyway? Surely LLVM will produce better code than a JavaScript JIT on non-dynamic code, since it's

Wouldn't they want to eventually use LLVM to compile Asm.js anyway? Surely LLVM will produce better code than a JavaScript JIT on non-dynamic code, since it's designed for it. OTOH the Asm.js approach has the advantages of backward compatibility and not being forced to forever support a specific LLVM bitcode version.