Auto merge of #135329 - oli-obk:push-sytltwnzxlrq, r=Noratrieb

Stable Hash: Ignore all HirIds that just identify the node itself

This should provide better incremental caching, but it seems there is more to it.

These IDs also serve no purpose being in the stable hash of the item they refer to, only when referring to *another* item is it important that we hash the `HirId`. So we can at least avoid the cost during stable hashing, even if we don't benefit from it by avoiding some queries' caches from being invalidated

Unsure how to make sure we do this right by construction. Would be nice to do something type based

compiler/rustc_hir/src/hir.rs

@@ -34,6 +34,7 @@ use crate::intravisit::FnKind;
 
 #[derive(Debug, Copy, Clone, HashStable_Generic)]
 pub struct Lifetime {
+    #[stable_hasher(ignore)]
     pub hir_id: HirId,
 
     /// Either "`'a`", referring to a named lifetime definition,
@@ -214,6 +215,7 @@ impl Path<'_> {
 pub struct PathSegment<'hir> {
     /// The identifier portion of this path segment.
     pub ident: Ident,
+    #[stable_hasher(ignore)]
     pub hir_id: HirId,
     pub res: Res,
 
@@ -304,6 +306,7 @@ pub enum ConstArgKind<'hir> {
 
 #[derive(Clone, Copy, Debug, HashStable_Generic)]
 pub struct InferArg {
+    #[stable_hasher(ignore)]
     pub hir_id: HirId,
     pub span: Span,
 }
@@ -592,6 +595,7 @@ pub enum GenericParamKind<'hir> {
 
 #[derive(Debug, Clone, Copy, HashStable_Generic)]
 pub struct GenericParam<'hir> {
+    #[stable_hasher(ignore)]
     pub hir_id: HirId,
     pub def_id: LocalDefId,
     pub name: ParamName,
@@ -850,6 +854,7 @@ impl<'hir> Generics<'hir> {
 /// A single predicate in a where-clause.
 #[derive(Debug, Clone, Copy, HashStable_Generic)]
 pub struct WherePredicate<'hir> {
+    #[stable_hasher(ignore)]
     pub hir_id: HirId,
     pub span: Span,
     pub kind: &'hir WherePredicateKind<'hir>,
@@ -1521,6 +1526,7 @@ impl fmt::Debug for DotDotPos {
 
 #[derive(Debug, Clone, Copy, HashStable_Generic)]
 pub struct PatExpr<'hir> {
+    #[stable_hasher(ignore)]
     pub hir_id: HirId,
     pub span: Span,
     pub kind: PatExprKind<'hir>,
@@ -1610,6 +1616,7 @@ pub enum PatKind<'hir> {
 /// A statement.
 #[derive(Debug, Clone, Copy, HashStable_Generic)]
 pub struct Stmt<'hir> {
+    #[stable_hasher(ignore)]
     pub hir_id: HirId,
     pub kind: StmtKind<'hir>,
     pub span: Span,
@@ -1641,6 +1648,7 @@ pub struct LetStmt<'hir> {
     pub init: Option<&'hir Expr<'hir>>,
     /// Else block for a `let...else` binding.
     pub els: Option<&'hir Block<'hir>>,
+    #[stable_hasher(ignore)]
     pub hir_id: HirId,
     pub span: Span,
     /// Can be `ForLoopDesugar` if the `let` statement is part of a `for` loop
@@ -1937,6 +1945,7 @@ pub type Lit = Spanned<LitKind>;
 /// `const N: usize = { ... }` with `tcx.hir().opt_const_param_default_param_def_id(..)`
 #[derive(Copy, Clone, Debug, HashStable_Generic)]
 pub struct AnonConst {
+    #[stable_hasher(ignore)]
     pub hir_id: HirId,
     pub def_id: LocalDefId,
     pub body: BodyId,
@@ -1946,6 +1955,7 @@ pub struct AnonConst {
 /// An inline constant expression `const { something }`.
 #[derive(Copy, Clone, Debug, HashStable_Generic)]
 pub struct ConstBlock {
+    #[stable_hasher(ignore)]
     pub hir_id: HirId,
     pub def_id: LocalDefId,
     pub body: BodyId,
@@ -1961,6 +1971,7 @@ pub struct ConstBlock {
 /// [rust lang reference]: https://doc.rust-lang.org/reference/expressions.html
 #[derive(Debug, Clone, Copy, HashStable_Generic)]
 pub struct Expr<'hir> {
+    #[stable_hasher(ignore)]
     pub hir_id: HirId,
     pub kind: ExprKind<'hir>,
     pub span: Span,
@@ -2839,6 +2850,7 @@ pub enum ImplItemKind<'hir> {
 /// * the `f(..): Bound` in `Trait<f(..): Bound>` (feature `return_type_notation`)
 #[derive(Debug, Clone, Copy, HashStable_Generic)]
 pub struct AssocItemConstraint<'hir> {
+    #[stable_hasher(ignore)]
     pub hir_id: HirId,
     pub ident: Ident,
     pub gen_args: &'hir GenericArgs<'hir>,
@@ -2907,6 +2919,7 @@ impl<'hir> AssocItemConstraintKind<'hir> {
 
 #[derive(Debug, Clone, Copy, HashStable_Generic)]
 pub struct Ty<'hir> {
+    #[stable_hasher(ignore)]
     pub hir_id: HirId,
     pub kind: TyKind<'hir>,
     pub span: Span,
@@ -3102,6 +3115,7 @@ pub struct UnsafeBinderTy<'hir> {
 
 #[derive(Debug, Clone, Copy, HashStable_Generic)]
 pub struct OpaqueTy<'hir> {
+    #[stable_hasher(ignore)]
     pub hir_id: HirId,
     pub def_id: LocalDefId,
     pub bounds: GenericBounds<'hir>,
@@ -3138,6 +3152,7 @@ impl PreciseCapturingArg<'_> {
 /// since resolve_bound_vars operates on `Lifetime`s.
 #[derive(Debug, Clone, Copy, HashStable_Generic)]
 pub struct PreciseCapturingNonLifetimeArg {
+    #[stable_hasher(ignore)]
     pub hir_id: HirId,
     pub ident: Ident,
     pub res: Res,
@@ -3311,6 +3326,7 @@ impl InlineAsm<'_> {
 /// Represents a parameter in a function header.
 #[derive(Debug, Clone, Copy, HashStable_Generic)]
 pub struct Param<'hir> {
+    #[stable_hasher(ignore)]
     pub hir_id: HirId,
     pub pat: &'hir Pat<'hir>,
     pub ty_span: Span,
@@ -3468,6 +3484,7 @@ pub struct Variant<'hir> {
     /// Name of the variant.
     pub ident: Ident,
     /// Id of the variant (not the constructor, see `VariantData::ctor_hir_id()`).
+    #[stable_hasher(ignore)]
     pub hir_id: HirId,
     pub def_id: LocalDefId,
     /// Fields and constructor id of the variant.
@@ -3540,6 +3557,7 @@ pub struct FieldDef<'hir> {
     pub span: Span,
     pub vis_span: Span,
     pub ident: Ident,
+    #[stable_hasher(ignore)]
     pub hir_id: HirId,
     pub def_id: LocalDefId,
     pub ty: &'hir Ty<'hir>,
@@ -3564,11 +3582,11 @@ pub enum VariantData<'hir> {
     /// A tuple variant.
     ///
     /// E.g., `Bar(..)` as in `enum Foo { Bar(..) }`.
-    Tuple(&'hir [FieldDef<'hir>], HirId, LocalDefId),
+    Tuple(&'hir [FieldDef<'hir>], #[stable_hasher(ignore)] HirId, LocalDefId),
     /// A unit variant.
     ///
     /// E.g., `Bar = ..` as in `enum Foo { Bar = .. }`.
-    Unit(HirId, LocalDefId),
+    Unit(#[stable_hasher(ignore)] HirId, LocalDefId),
 }
 
 impl<'hir> VariantData<'hir> {