Auto merge of rust-lang#104282 - cjgillot:intern-span, r=compiler-errors

Hash spans when interning types

Ignoring hash for spans creates an inconsistency between the `Hash` impl for `WithStableHash`, which takes them into account, and the `HashStable` impl which does not.

cc `@compiler-errors`

Fixes rust-lang#104271
Fixes rust-lang#104255
Fixes rust-lang#104238

Author: bors