Rollup merge of #139675 - sayantn:avx10, r=Amanieu

Add the AVX10 target features

Parent #138843

Adds the `avx10_target_feature` feature gate, and `avx10.1` and `avx10.2` target features.

It is confirmed that Intel is dropping AVX10/256 (see [this comment](https://github.com/rust-lang/rust/issues/111137#issuecomment-2795442288)), so this should be safe to implement now.

The LLVM fix for llvm/llvm-project#135394 was merged, and has been backported to LLVM20, and the patch has also been propagated to rustc in #140502

`@rustbot` label O-x86_64 O-x86_32 A-target-feature A-SIMD

compiler/rustc_codegen_llvm/src/llvm_util.rs

@@ -301,6 +301,9 @@ pub(crate) fn to_llvm_features<'a>(sess: &Session, s: &'a str) -> Option<LLVMFea
             None
         }
         ("x86", "movrs") if get_version().0 < 20 => None,
+        ("x86", "avx10.1") => Some(LLVMFeature::new("avx10.1-512")),
+        ("x86", "avx10.2") if get_version().0 < 20 => None,
+        ("x86", "avx10.2") if get_version().0 >= 20 => Some(LLVMFeature::new("avx10.2-512")),
         (_, s) => Some(LLVMFeature::new(s)),
     }
 }