Made add in codegen faster

Cargo.lock

@@ -45,6 +45,12 @@ dependencies = [
  "generic-array",
 ]
 
+[[package]]
+name = "bytecount"
+version = "0.6.9"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "175812e0be2bccb6abe50bb8d566126198344f707e304f45c648fd8f2cc0365e"
+
 [[package]]
 name = "bytes"
 version = "1.11.1"
@@ -493,6 +499,7 @@ dependencies = [
 name = "mist-codegen"
 version = "0.3.3-alpha.0"
 dependencies = [
+ "bytecount",
  "mist-parser",
 ]