Auto merge of #107707 - calebzulawski:remove-features, r=Amanieu

Remove misleading target feature aliases

Fixes #100752.  This is a follow up to #103750. These aliases could not be completely removed until rust-lang/stdarch#1355 landed.

cc `@Amanieu`

compiler/rustc_codegen_llvm/src/llvm_util.rs

@@ -155,12 +155,6 @@ pub fn to_llvm_features<'a>(sess: &Session, s: &'a str) -> SmallVec<[&'a str; 2]
         ("x86", "rdrand") => smallvec!["rdrnd"],
         ("x86", "bmi1") => smallvec!["bmi"],
         ("x86", "cmpxchg16b") => smallvec!["cx16"],
-        // FIXME: These aliases are misleading, and should be removed before avx512_target_feature is
-        // stabilized. They must remain until std::arch switches off them.
-        // rust#100752
-        ("x86", "avx512vaes") => smallvec!["vaes"],
-        ("x86", "avx512gfni") => smallvec!["gfni"],
-        ("x86", "avx512vpclmulqdq") => smallvec!["vpclmulqdq"],
         ("aarch64", "rcpc2") => smallvec!["rcpc-immo"],
         ("aarch64", "dpb") => smallvec!["ccpp"],
         ("aarch64", "dpb2") => smallvec!["ccdp"],

compiler/rustc_codegen_ssa/src/target_features.rs

@@ -173,16 +173,13 @@ const X86_ALLOWED_FEATURES: &[(&str, Option<Symbol>)] = &[
     ("avx512dq", Some(sym::avx512_target_feature)),
     ("avx512er", Some(sym::avx512_target_feature)),
     ("avx512f", Some(sym::avx512_target_feature)),
-    ("avx512gfni", Some(sym::avx512_target_feature)),
     ("avx512ifma", Some(sym::avx512_target_feature)),
     ("avx512pf", Some(sym::avx512_target_feature)),
-    ("avx512vaes", Some(sym::avx512_target_feature)),
     ("avx512vbmi", Some(sym::avx512_target_feature)),
     ("avx512vbmi2", Some(sym::avx512_target_feature)),
     ("avx512vl", Some(sym::avx512_target_feature)),
     ("avx512vnni", Some(sym::avx512_target_feature)),
     ("avx512vp2intersect", Some(sym::avx512_target_feature)),
-    ("avx512vpclmulqdq", Some(sym::avx512_target_feature)),
     ("avx512vpopcntdq", Some(sym::avx512_target_feature)),
     ("bmi1", None),
     ("bmi2", None),