…result" setting

It is no longer necessary as __rust_start_panic switched to the Rust abi.

…out_of

This avoids some type interning and a query execution. It also just
makes the code simpler.

…rom-raw-parts, r=m-ou-se,the8472

Stabilize `nonnull_slice_from_raw_parts`

FCP is done: rust-lang#71941 (comment)
Note that this doesn't const-stabilize `NonNull::slice_from_raw_parts` as `slice_from_raw_parts_mut` isn't const-stabilized yet. Given rust-lang#67456 and rust-lang#57349, it's not likely available soon, meanwhile, stabilizing only the feature makes some sense, I think.

Closes rust-lang#71941

Follow C-RW-VALUE in std::io::Cursor example

rustc-dev-guide says to do this:

r? ``@steveklabnik``

…=ChrisDenton

Remove unnecessary raw pointer in __rust_start_panic arg

It is no longer necessary as __rust_start_panic switched to the Rust abi.

…=Nilstrieb

Use an IndexVec to debug fingerprints.

Uncontroversial part of rust-lang#109050

…stion, r=compiler-errors

fix type suggestions in match arms

fix rust-lang#109586

…ing, r=notriddle

Fix "Directly go to item in search if there is only one result" setting

Part of rust-lang#66181.

The setting was actually broken, so I fixed it when I added the GUI test.

r? `@notriddle`

…=errors

debuginfo: Get pointer size/align from tcx.data_layout instead of layout_of

This avoids some type interning and a query execution. It also just makes the code simpler.

…-obl, r=oli-obk

Don't elaborate non-obligations into obligations

It's suspicious to elaborate a `PolyTraitRef` or `Predicate` into an `Obligation`, since the former does not have a param-env associated with it, but the latter does. This is a footgun that, while not being misused *currently* in the compiler, easily could be misused by someone less familiar with the elaborator's inner workings.

This PR just changes the API -- ideally, the elaborator wouldn't even have to deal with obligations if we're not elaborating obligations, but that would require a bit more abstraction than I could be bothered with today.