Clean up rustc_*/Cargo.toml.

- Sort dependencies and features sections.
- Add `tidy` markers to the sorted sections so they stay sorted.
- Remove empty `[lib`] sections.
- Remove "See more keys..." comments.

Excluded files:
- rustc_codegen_{cranelift,gcc}, because they're external.
- rustc_lexer, because it has external use.
- stable_mir, because it has external use.

compiler/rustc_hir/Cargo.toml

@@ -3,18 +3,18 @@ name = "rustc_hir"
 version = "0.0.0"
 edition = "2021"
 
-[lib]
-
 [dependencies]
+# tidy-alphabetical-start
+odht = { version = "0.3.1", features = ["nightly"] }
 rustc_arena = { path = "../rustc_arena" }
-rustc_target = { path = "../rustc_target" }
-rustc_macros = { path = "../rustc_macros" }
+rustc_ast = { path = "../rustc_ast" }
 rustc_data_structures = { path = "../rustc_data_structures" }
 rustc_error_messages = { path = "../rustc_error_messages" }
 rustc_index = { path = "../rustc_index" }
-rustc_span = { path = "../rustc_span" }
+rustc_macros = { path = "../rustc_macros" }
 rustc_serialize = { path = "../rustc_serialize" }
-rustc_ast = { path = "../rustc_ast" }
-tracing = "0.1"
+rustc_span = { path = "../rustc_span" }
+rustc_target = { path = "../rustc_target" }
 smallvec = { version = "1.8.1", features = ["union", "may_dangle"] }
-odht = { version = "0.3.1", features = ["nightly"] }
+tracing = "0.1"
+# tidy-alphabetical-end