Rollup merge of #70344 - Centril:hir-pretty, r=eddyb

Decouple `rustc_hir::print` into `rustc_hir_pretty`

High level summary:
- The HIR pretty printer, `rustc_hir::print` is moved into a new crate `rustc_hir_pretty`.
- `rustc_ast_pretty` and `rustc_errors` are dropped as `rustc_hir` dependencies.
- The dependence on HIR pretty is generally reduced, leaving `rustc_save_analysis`, `rustdoc`, `rustc_metadata`, and `rustc_driver` as the remaining clients.

The main goal here is to reduce `rustc_hir`'s dependencies and its size such that it can start and finish earlier, thereby working towards https://github.com/rust-lang/rust/issues/65031.

r? @Zoxc

src/test/ui/methods/method-path-in-pattern.stderr

@@ -4,13 +4,13 @@ error[E0533]: expected unit struct, unit variant or constant, found associated f
 LL |         Foo::bar => {}
    |         ^^^^^^^^
 
-error[E0533]: expected unit struct, unit variant or constant, found associated function `Foo::bar`
+error[E0533]: expected unit struct, unit variant or constant, found associated function `<Foo>::bar`
   --> $DIR/method-path-in-pattern.rs:19:9
    |
 LL |         <Foo>::bar => {}
    |         ^^^^^^^^^^
 
-error[E0533]: expected unit struct, unit variant or constant, found associated function `Foo::trait_bar`
+error[E0533]: expected unit struct, unit variant or constant, found associated function `<Foo>::trait_bar`
   --> $DIR/method-path-in-pattern.rs:23:9
    |
 LL |         <Foo>::trait_bar => {}
@@ -22,7 +22,7 @@ error[E0533]: expected unit struct, unit variant or constant, found associated f
 LL |     if let Foo::bar = 0u32 {}
    |            ^^^^^^^^
 
-error[E0533]: expected unit struct, unit variant or constant, found associated function `Foo::bar`
+error[E0533]: expected unit struct, unit variant or constant, found associated function `<Foo>::bar`
   --> $DIR/method-path-in-pattern.rs:28:12
    |
 LL |     if let <Foo>::bar = 0u32 {}

src/test/ui/privacy/associated-item-privacy-trait.rs

@@ -21,9 +21,9 @@ mod priv_trait {
         Pub.method();
         //~^ ERROR type `for<'r> fn(&'r Self) {<Self as priv_trait::PrivTr>::method}` is private
         <Pub as PrivTr>::CONST;
-        //~^ ERROR associated constant `PrivTr::CONST` is private
+        //~^ ERROR associated constant `<Pub as PrivTr>::CONST` is private
         let _: <Pub as PrivTr>::AssocTy;
-        //~^ ERROR associated type `PrivTr::AssocTy` is private
+        //~^ ERROR associated type `<Pub as PrivTr>::AssocTy` is private
         pub type InSignatureTy = <Pub as PrivTr>::AssocTy;
         //~^ ERROR trait `priv_trait::PrivTr` is private
         pub trait InSignatureTr: PrivTr {}
@@ -115,7 +115,7 @@ mod priv_parent_substs {
         <Priv as PubTr<_>>::CONST;
         //~^ ERROR type `priv_parent_substs::Priv` is private
 
-        let _: <Pub as PubTr>::AssocTy;  // FIXME no longer an error?!
+        let _: <Pub as PubTr>::AssocTy; // FIXME no longer an error?!
         let _: <Pub as PubTr<_>>::AssocTy;
         //~^ ERROR type `priv_parent_substs::Priv` is private
         let _: <Priv as PubTr<_>>::AssocTy;

src/test/ui/privacy/associated-item-privacy-trait.stderr

@@ -31,7 +31,7 @@ LL |     priv_trait::mac!();
    |
    = note: this error originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
 
-error: associated constant `PrivTr::CONST` is private
+error: associated constant `<Pub as PrivTr>::CONST` is private
   --> $DIR/associated-item-privacy-trait.rs:23:9
    |
 LL |         <Pub as PrivTr>::CONST;
@@ -42,7 +42,7 @@ LL |     priv_trait::mac!();
    |
    = note: this error originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
 
-error: associated type `PrivTr::AssocTy` is private
+error: associated type `<Pub as PrivTr>::AssocTy` is private
   --> $DIR/associated-item-privacy-trait.rs:25:16
    |
 LL |         let _: <Pub as PrivTr>::AssocTy;

src/test/ui/qualified/qualified-path-params.stderr

@@ -1,4 +1,4 @@
-error[E0533]: expected unit struct, unit variant or constant, found associated function `<<S as Tr>::A>::f<u8>`
+error[E0533]: expected unit struct, unit variant or constant, found associated function `<S as Tr>::A::f::<u8>`
   --> $DIR/qualified-path-params.rs:20:9
    |
 LL |         <S as Tr>::A::f::<u8> => {}