Fixes: rust-lang#127942

…ess-ids, r=aDotInTheVoid

rustdoc-json: change item ID's repr from a string to an int

Following [this discussion on Zulip](https://rust-lang.zulipchat.com/#narrow/stream/266220-t-rustdoc/topic/Optimizing.20the.20.60Id.60.20type.20in.20.60rustdoc-types.60), I've changed the repr of `rustdoc_json_types::Id` from a String to a u32, by adding a `clean::ItemId` interner to `JsonRenderer`

r? `@aDotInTheVoid`

…exhaustive, r=joboet

Stabilize `debug_more_non_exhaustive`

Fixes: rust-lang#127942

stabilize const_result

Waiting for FCP to complete in rust-lang#82814

Fixes rust-lang#82814

Support clobber_abi in MSP430 inline assembly

This supports `clobber_abi` which is one of the requirements of stabilization mentioned in rust-lang#93335.

Refs: Section 3.2 "Register Conventions" in [MSP430 Embedded Application Binary Interface](https://www.ti.com/lit/an/slaa534a/slaa534a.pdf)

cc `@cr1901`

r? `@Amanieu`

`@rustbot` label +O-msp430

… r=RalfJung

Stabilise `const_char_encode_utf8`.

Closes: rust-lang#130512

This PR stabilises the `const_char_encode_utf8` feature gate (i.e. support for `char::encode_utf8` in const scenarios).

Note that the linked tracking issue is currently awaiting FCP.