rustc_driver: Remove unused dependencies rustc_mir_build and rustc_typeck

Unused since commit dc3eabd
("Store THIR in `IndexVec`s instead of an `Arena`").

Author: joshtriplett

Cargo.lock

@@ -3808,15 +3808,13 @@ dependencies = [
  "rustc_metadata",
  "rustc_middle",
  "rustc_mir",
- "rustc_mir_build",
  "rustc_parse",
  "rustc_plugin_impl",
  "rustc_save_analysis",
  "rustc_serialize",
  "rustc_session",
  "rustc_span",
  "rustc_target",
- "rustc_typeck",
  "tracing",
  "tracing-subscriber",
  "tracing-tree",

compiler/rustc_driver/Cargo.toml

@@ -34,8 +34,6 @@ rustc_interface = { path = "../rustc_interface" }
 rustc_serialize = { path = "../rustc_serialize" }
 rustc_ast = { path = "../rustc_ast" }
 rustc_span = { path = "../rustc_span" }
-rustc_mir_build = { path = "../rustc_mir_build" }
-rustc_typeck = { path = "../rustc_typeck" }
 
 [target.'cfg(windows)'.dependencies]
 winapi = { version = "0.3", features = ["consoleapi", "debugapi", "processenv"] }