ABI checks: add support for loongarch

LoongArch psABI[^1] specifies that LSX vector types are passed via general-purpose
registers, while LASX vector types are passed indirectly through the stack.

This patch addresses the following warnings:

```
warning: this function call uses a SIMD vector type that is not currently supported with the chosen ABI
    --> .../library/core/src/../../stdarch/crates/core_arch/src/loongarch64/lsx/generated.rs:3695:5
     |
3695 |     __lsx_vreplgr2vr_b(a)
     |     ^^^^^^^^^^^^^^^^^^^^^ function called here
     |
     = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
     = note: for more information, see issue #116558 <https://github.com/rust-lang/rust/issues/116558>
     = note: `#[warn(abi_unsupported_vector_types)]` on by default
```

[^1]: https://github.com/loongson/la-abi-specs/blob/release/lapcs.adoc

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