deps(rustc_expand): Add rustc_middle as a dep

Author: futile

Cargo.lock

@@ -3654,6 +3654,7 @@ dependencies = [
  "rustc_lexer",
  "rustc_lint_defs",
  "rustc_macros",
+ "rustc_middle",
  "rustc_parse",
  "rustc_serialize",
  "rustc_session",

compiler/rustc_expand/Cargo.toml

@@ -21,6 +21,7 @@ rustc_hir = { path = "../rustc_hir" }
 rustc_lexer = { path = "../rustc_lexer" }
 rustc_lint_defs = { path = "../rustc_lint_defs" }
 rustc_macros = { path = "../rustc_macros" }
+rustc_middle = { path = "../rustc_middle" }
 rustc_parse = { path = "../rustc_parse" }
 rustc_serialize = { path = "../rustc_serialize" }
 rustc_session = { path = "../rustc_session" }