… alloc

… feature be enabled

Haiku doesn't define SIGIO. The nix crate already employs this workaround:
https://github.com/nix-rust/nix/blob/5dedbc7850448ae3922ab0a833f3eb971bf7e25f/src/sys/signal.rs#L92-L94

This is a tiny optimization

It returns the previous work product or panics if there is none. This rename
makes the purpose of this method clearer.

…e_dir calls

This improves clarity of the code a bit

A WorkProduct without a saved file is useless

Co-authored-by: Eduard-Mihai Burtescu <edy.burt@gmail.com>

I was experimenting with cross-language LTO for the wasm target recently
between Rust and C and found that C was injecting the `+mutable-globals`
flag on all functions. When specifying the corresponding
`-Ctarget-feature=+mutable-globals` feature to Rust it prints a warning
about an unknown feature. I've added the `mutable-globals` feature plus
another few I know of to the list of known features for wasm targets.
These features all continue to be unstable to source code as they were
before.

…, r=nagisa

Various refactors to the incr comp workproduct handling

This is the result of me looking into adding support for having multiple object files for a single codegen unit to incr comp. This is necessary to support inline assembly in cg_clif without requiring partial linking which is not supported on Windows and seems to fail on macOS for some reason. Cg_clif uses an external assembler to handle inline asm and thus produces one object file with regular functions and one object file containing compiled inline asm for each codegen unit which uses inline asm. Current incr comp can't handle this. This PR doesn't yet add support for this, but it makes it easier to do so.

…rochenkov

Allow unstable items to be re-exported unstably without requiring the feature be enabled

Closes rust-lang#94972

The diagnostic may need some work still, and I haven't added a test yet

Fix ICEs from zsts within unsized types with non-zero offsets

- Fixes rust-lang#97732
- Fixes ICEs while compiling `alloc` with `-Z randomize-layout`

r? ``@eddyb``

Remove SIGIO reference on Haiku

Haiku doesn't define SIGIO. The nix crate already employs this workaround:
https://github.com/nix-rust/nix/blob/5dedbc7850448ae3922ab0a833f3eb971bf7e25f/src/sys/signal.rs#L92-L94

…chenkov

Add some unstable target features for the wasm target codegen

I was experimenting with cross-language LTO for the wasm target recently
between Rust and C and found that C was injecting the `+mutable-globals`
flag on all functions. When specifying the corresponding
`-Ctarget-feature=+mutable-globals` feature to Rust it prints a warning
about an unknown feature. I've added the `mutable-globals` feature plus
another few I know of to the list of known features for wasm targets.
These features all continue to be unstable to source code as they were
before.