Tracking issue for release notes of #133870: Stabilize `asm_goto` feature gate

[rustbot]

This issue tracks the release notes text for #133870.

Steps

• Proposed text is drafted by PR author (or team) making the noteworthy change.
• Issue is nominated for release team review of clarity for wider audience.
• Release team includes text in release notes/blog posts.

Release notes text

The responsible team for the underlying change should edit this section to replace the automatically generated link with a succinct description of what changed, drawing upon text proposed by the author (either in discussion or through direct editing).

# Language
- [Stabilize `asm_goto` feature](https://github.com/rust-lang/rust/pull/133870)

Tip

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Release blog section

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# Stabilization of `asm_goto`  

The `asm_goto` feature is now stabilized, allowing inline assembly (`asm!`) to jump to labeled blocks within Rust code. This enables more flexible low-level programming, such as implementing optimized control flow in OS kernels or interacting with hardware more efficiently. 

- The `asm!` macro now supports a label operand, which acts as a jump target.  
- The label must be a block expression with a return type of `()` or `!`.  
- The block executes when jumped to, and execution continues after the `asm!` block.  
- The safety context inside the block is separate, requiring explicit `unsafe` markings for unsafe operations.  
- Using `asm_goto` with output operands (`asm_goto_with_outputs`) remains unstable and is tracked separately.  

```rust
unsafe {
    asm!(
        "jmp {}",
        label {
            println!("Jumped from asm!");
        }
    );
}
```

cc @nbdd0121, @tmandry -- origin issue/PR authors and assignees for starting to draft text

[NinoPinzer]

Category: Compiler

Stabilization of asm_goto

The asm_goto feature is now stabilized, allowing inline assembly (asm!) to jump to labeled blocks within Rust code. This enables more flexible low-level programming, such as implementing optimized control flow in OS kernels or interacting with hardware more efficiently.

Key changes:

• The asm! macro now supports a label operand, which acts as a jump target.
• The label must be a block expression with a return type of () or !.
• The block executes when jumped to, and execution continues after the asm! block.
• The safety context inside the block is separate, requiring explicit unsafe markings for unsafe operations.
• Using asm_goto with output operands (asm_goto_with_outputs) remains unstable and is tracked separately.

Example usage:

unsafe {
    asm!(
        "jmp {}",
        label {
            println!("Jumped from asm!");
        }
    );
}