use LLVM.jl 9.4.1

Author: vchuravy

Project.toml

@@ -36,7 +36,7 @@ Atomix = "0.1, 1"
 EnzymeCore = "0.7, 0.8.1"
 GPUCompiler = "1.2"
 InteractiveUtils = "1.6"
-LLVM = "9"
+LLVM = "9.4.1"
 LinearAlgebra = "1.6"
 MacroTools = "0.5"
 PrecompileTools = "1"