Part of this project was building support into LLVM that you would need to build a really great dynamic language JIT. Another key aspect was having lower compil

Part of this project was building support into LLVM that you would need to build a really great dynamic language JIT. Another key aspect was having lower compilation tiers that don't use LLVM. Using LLVM as a fourth tier works much better than using it as a first or even second tier (we have tried in the past).