The computation is actually much simpler, and can be done by directly
fetching the HIR for the `FnDecl` and its generics.

Co-authored-by: NFabian Wolff <fabian.wolff@alumni.ethz.ch>

Signed-off-by: NMiguel Guarniz <mi9uel9@gmail.com>

Signed-off-by: NMiguel Guarniz <mi9uel9@gmail.com>

Whether `drop_in_place` can abort does depend on the
`panic-in-drop` option while compiling the current crate,
not `core`

Only crate root def-ids don't have a parent, and in majority of cases the argument of `DefIdTree::parent` cannot be a crate root.
So we now panic by default in `parent` and introduce a new non-panicing function `opt_parent` for cases where the argument can be a crate root.

Same applies to `local_parent`/`opt_local_parent`.

This allows to avoid looking at HIR from borrowck.

This PR cleans up the rest of the spelling mistakes in the compiler comments. This PR does not change any literal or code spelling issues.

This allows to compute the `BodyOwnerKind` from `DefKind` only, and
removes a direct dependency of some MIR queries onto HIR.

As a side effect, it also simplifies metadata, since we don't need 4
flavours of `EntryKind::*Static` any more.

This is a continuation of #60109, which noted that while the ADX
intrinsics were stabilized, the corresponding target feature never was.

This PR follows the same general structure and stabilizes the ADX target
feature.

This commit makes `AdtDef` use `Interned`. Much the commit is tedious
changes to introduce getter functions. The interesting changes are in
`compiler/rustc_middle/src/ty/adt.rs`.