message: Update inkwell to our own copy until upstream supports LLVM 8.
  LLVM 8 support from .
diff: @@ -6,7 +6,7 @@ edition = "2018"
  [dependencies]
  wasmer-runtime-core = { path = "../runtime-core", version = "0.5.4" }
  -inkwell = { git = "https://github.com/lumen/inkwell", rev = "64921e418c3e8f4b32f9beed56ebd5aac4e677c7", features = ["llvm8-0"] }
  +inkwell = { git = "https://github.com/wasmerio/inkwell", branch = "llvm8-0", features = ["llvm8-0"] }
  wasmparser = "0.32.1"
  hashbrown = "0.1.8"
  smallvec = "0.6.8"
  