Shrink hir::def::Res.

`Res::SelfTy` currently has two `Option`s. When the second one is `Some`
the first one is never consulted. So we can split it into two variants,
`Res::SelfTyParam` and `Res::SelfTyAlias`, reducing the size of `Res`
from 24 bytes to 12. This then shrinks `hir::Path` and
`hir::PathSegment`, which are the HIR types that take up the most space.

compiler/rustc_hir_analysis/src/mem_categorization.rs

@@ -560,7 +560,8 @@ impl<'a, 'tcx> MemCategorizationContext<'a, 'tcx> {
             Res::Def(DefKind::Ctor(CtorOf::Struct, ..), _)
             | Res::Def(DefKind::Struct | DefKind::Union | DefKind::TyAlias | DefKind::AssocTy, _)
             | Res::SelfCtor(..)
-            | Res::SelfTy { .. } => {
+            | Res::SelfTyParam { .. }
+            | Res::SelfTyAlias { .. } => {
                 // Structs and Unions have only have one variant.
                 Ok(VariantIdx::new(0))
             }