Remove all uses of #[stable_hasher(project(...))] in order to mitigate

incremental compilation related ICEs as reported in rust-lang#94124 for Rust 1.59.

compiler/rustc_hir/src/hir.rs

@@ -205,7 +205,6 @@ impl Path<'_> {
 #[derive(Debug, HashStable_Generic)]
 pub struct PathSegment<'hir> {
  /// The identifier portion of this path segment.
- #[stable_hasher(project(name))]
  pub ident: Ident,
  // `id` and `res` are optional. We currently only use these in save-analysis,
  // any path segments without these will not have save-analysis info and
@@ -850,7 +849,6 @@ pub struct PatField<'hir> {
  #[stable_hasher(ignore)]
  pub hir_id: HirId,
  /// The identifier for the field.
- #[stable_hasher(project(name))]
  pub ident: Ident,
  /// The pattern the field is destructured to.
  pub pat: &'hir Pat<'hir>,
@@ -2127,7 +2125,6 @@ pub const FN_OUTPUT_NAME: Symbol = sym::Output;
 #[derive(Debug, HashStable_Generic)]
 pub struct TypeBinding<'hir> {
  pub hir_id: HirId,
- #[stable_hasher(project(name))]
  pub ident: Ident,
  pub gen_args: &'hir GenericArgs<'hir>,
  pub kind: TypeBindingKind<'hir>,
@@ -2515,7 +2512,6 @@ pub struct EnumDef<'hir> {
 #[derive(Debug, HashStable_Generic)]
 pub struct Variant<'hir> {
  /// Name of the variant.
- #[stable_hasher(project(name))]
  pub ident: Ident,
  /// Id of the variant (not the constructor, see `VariantData::ctor_hir_id()`).
  pub id: HirId,
@@ -2605,7 +2601,6 @@ impl VisibilityKind<'_> {
 #[derive(Debug, HashStable_Generic)]
 pub struct FieldDef<'hir> {
  pub span: Span,
- #[stable_hasher(project(name))]
  pub ident: Ident,
  pub vis: Visibility<'hir>,
  pub hir_id: HirId,
@@ -2864,7 +2859,6 @@ impl ItemKind<'_> {
 #[derive(Encodable, Debug, HashStable_Generic)]
 pub struct TraitItemRef {
  pub id: TraitItemId,
- #[stable_hasher(project(name))]
  pub ident: Ident,
  pub kind: AssocItemKind,
  pub span: Span,
@@ -2880,7 +2874,6 @@ pub struct TraitItemRef {
 #[derive(Debug, HashStable_Generic)]
 pub struct ImplItemRef {
  pub id: ImplItemId,
- #[stable_hasher(project(name))]
  pub ident: Ident,
  pub kind: AssocItemKind,
  pub span: Span,
@@ -2919,7 +2912,6 @@ impl ForeignItemId {
 #[derive(Debug, HashStable_Generic)]
 pub struct ForeignItemRef {
  pub id: ForeignItemId,
- #[stable_hasher(project(name))]
  pub ident: Ident,
  pub span: Span,
 }

compiler/rustc_middle/src/ty/assoc.rs

@@ -43,7 +43,6 @@ impl AssocItemContainer {
 #[derive(Copy, Clone, Debug, PartialEq, HashStable, Eq, Hash)]
 pub struct AssocItem {
  pub def_id: DefId,
- #[stable_hasher(project(name))]
  pub ident: Ident,
  pub kind: AssocKind,
  pub vis: Visibility,

compiler/rustc_middle/src/ty/mod.rs

@@ -1502,7 +1502,6 @@ pub struct VariantDef {
  /// If this variant is a struct variant, then this is `None`.
  pub ctor_def_id: Option<DefId>,
  /// Variant or struct name.
- #[stable_hasher(project(name))]
  pub ident: Ident,
  /// Discriminant of this variant.
  pub discr: VariantDiscr,
@@ -1598,7 +1597,6 @@ pub enum VariantDiscr {
 #[derive(Debug, HashStable, TyEncodable, TyDecodable)]
 pub struct FieldDef {
  pub did: DefId,
- #[stable_hasher(project(name))]
  pub ident: Ident,
  pub vis: Visibility,
 }