…clif-2023-10-24

…t-codegen

This ensures that cg_clif can be built for targets that aren't natively
supported by Cranelift. It will not be possible to compile for the host
in this case, but cross-compilation will still be possible.

We won't distribute cg_clif as rustup component for any targets that
aren't natively supported by Cranelift, but will still build it if
codegen-backends lists "cranelift".

This adds support for loongarch and a bunch of other targets

…ilee

Bump stdarch submodule and remove special handling for LLVM intrinsics that are no longer needed

Bumps stdarch to pull rust-lang/stdarch#1477, which reimplemented some functions with portable SIMD intrinsics instead of arch specific LLVM intrinsics.

Handling of those LLVM intrinsics is removed from cranelift codegen and miri.

cc `@RalfJung` `@bjorn3`

…rk-Simulacrum

Distribute cg_clif as rustup component on the nightly channel

This makes it possible to use cg_clif using:

```bash
$ rustup component add rustc-codegen-cranelift-preview --toolchain nightly
$ RUSTFLAGS="-Zcodegen-backend=cranelift" cargo +nightly build
```

cc rust-lang/compiler-team#405.
r? `@Mark-Simulacrum`

The LLVM backend is generally available, while the gnu assembler is not
on Windows and many other platforms by default.

But exclude sym operands for now as they are somewhat broken.

…assembler

Support and stabilize inline asm on all platforms

…clif-2023-10-29