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Auto merge of #99443 - jam1garner:mips-virt-feature, r=nagisa
Add support for MIPS VZ ISA extension [Link to relevant LLVM line where virt extension is specified](https://github.com/llvm/llvm-project/blob/83fab8cee9d6b9fa911195c20325b4512a7a22ef/llvm/lib/Target/Mips/Mips.td#L172-L173) This has been tested on mips-unknown-linux-musl with a target-cpu that is >= MIPS32 5 and `target-features=+virt`. The example was checked in a disassembler to ensure the correct assembly sequence was being generated using the virtualization instructions. Needed additional work: * MIPS is missing from [the Rust reference CPU feature lists](https://doc.rust-lang.org/reference/attributes/codegen.html#available-features) Example docs for later: ```md #### `mips` or `mips64` This platform requires that `#[target_feature]` is only applied to [`unsafe` functions][unsafe function]. This target's feature support is currently unstable and must be enabled by `#![feature(mips_target_feature)]` ([Issue #44839]) [Issue #44839]: #44839 Further documentation on these features can be found in the [MIPS Instruction Set Reference Manual], or elsewhere on [mips.com]. [MIPS Instruction Set Reference Manual]: https://s3-eu-west-1.amazonaws.com/downloads-mips/documents/MD00086-2B-MIPS32BIS-AFP-6.06.pdf [developer.arm.com]: https://www.mips.com/products/architectures/ase/ Feature | Implicitly Enables | Description ---------------|--------------------|------------------- `fp64` | | 64-bit Floating Point `msa` | | "MIPS SIMD Architecture" `virt` | | Virtualization instructions (VZ ASE) ``` If the above is good I can also submit a PR for that if there's interest in documenting it while it's still unstable. Otherwise that can be dropped, I just wrote it before realizing it was possibly not a good idea. Relevant to #44839
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