Rename #[rustc_hidden_type_of_opaques] to #[rustc_dump_hidden_type_of_opaques]

Author: fmease

src/compiler-debugging.md

@@ -275,14 +275,14 @@ Here are some notable ones:
 |----------------|-------------|
 | `rustc_def_path` | Dumps the [`def_path_str`] of an item. |
 | `rustc_dump_def_parents` | Dumps the chain of `DefId` parents of certain definitions. |
+| `rustc_dump_hidden_type_of_opaques` | Dumps the [hidden type of each opaque types][opaq] in the crate. |
 | `rustc_dump_inferred_outlives` | Dumps implied bounds of an item. More precisely, the [`inferred_outlives_of`] an item. |
 | `rustc_dump_item_bounds` | Dumps the [`item_bounds`] of an item. |
 | `rustc_dump_layout` | [See this section](#debugging-type-layouts). |
 | `rustc_dump_object_lifetime_defaults` | Dumps the [object lifetime defaults] of an item. |
 | `rustc_dump_predicates` | Dumps the [`predicates_of`] an item. |
 | `rustc_dump_variances` | Dumps the [variances] of an item. |
 | `rustc_dump_vtable` | Dumps the vtable layout of an impl, or a type alias of a dyn type. |
-| `rustc_hidden_type_of_opaques` | Dumps the [hidden type of each opaque types][opaq] in the crate. |
 | `rustc_regions` | Dumps NLL closure region requirements. |
 | `rustc_symbol_name` | Dumps the mangled & demangled [`symbol_name`] of an item. |