Split `rustc_hir_id` out of `rustc_hir`

Some crates depend on `rustc_hir` but only want `HirId` and similar id
types. `rustc_hir` is a heavy dependency, since it pulls in
`rustc_target`. Split these types out into their own crate
`rustc_hir_id`.

This allows `rustc_errors` to drop its direct dependency on `rustc_hir`.

(`rustc_errors` still depends on `rustc_hir` indirectly through
`rustc_lint_defs`; a subsequent commit will fix that.)

2 files changed, 2 insertions, 2 deletions

diff --git a/compiler/rustc_errors/Cargo.toml b/compiler/rustc_errors/Cargo.toml
index 7fb3533f109..ad6d29e21fc 100644
--- a/compiler/rustc_errors/Cargo.toml
+++ b/compiler/rustc_errors/Cargo.toml
@@ -13,7 +13,7 @@ rustc_error_codes = { path = "../rustc_error_codes" }
 rustc_error_messages = { path = "../rustc_error_messages" }
 rustc_fluent_macro = { path = "../rustc_fluent_macro" }
 rustc_hashes = { path = "../rustc_hashes" }
-rustc_hir = { path = "../rustc_hir" }
+rustc_hir_id = { path = "../rustc_hir_id" }
 rustc_index = { path = "../rustc_index" }
 rustc_lexer = { path = "../rustc_lexer" }
 rustc_lint_defs = { path = "../rustc_lint_defs" }
diff --git a/compiler/rustc_errors/src/lib.rs b/compiler/rustc_errors/src/lib.rs
index 0a2bfee8b29..a775b70dbee 100644
--- a/compiler/rustc_errors/src/lib.rs
+++ b/compiler/rustc_errors/src/lib.rs
@@ -60,7 +60,7 @@ pub use rustc_error_messages::{
     fallback_fluent_bundle, fluent_bundle, into_diag_arg_using_display,
 };
 use rustc_hashes::Hash128;
-use rustc_hir::HirId;
+use rustc_hir_id::HirId;
 pub use rustc_lint_defs::{Applicability, listify, pluralize};
 use rustc_lint_defs::{Lint, LintExpectationId};
 use rustc_macros::{Decodable, Encodable};