Unrolled build for rust-lang#121145

Rollup merge of rust-lang#121145 - adamgemmell:dev/adagem01/combined-target-features, r=Amanieu

Update aarch64 target feature docs to match LLVM

rust-lang/stdarch#1432 rust-lang/stdarch#1527

r? ```@Amanieu```

compiler/rustc_target/src/target_features.rs

@@ -86,7 +86,7 @@ const ARM_ALLOWED_FEATURES: &[(&str, Stability)] = &[
 
 const AARCH64_ALLOWED_FEATURES: &[(&str, Stability)] = &[
  // tidy-alphabetical-start
- // FEAT_AES
+ // FEAT_AES & FEAT_PMULL
  ("aes", Stable),
  // FEAT_BF16
  ("bf16", Stable),
@@ -124,7 +124,7 @@ const AARCH64_ALLOWED_FEATURES: &[(&str, Stability)] = &[
  ("lor", Stable),
  // FEAT_LSE
  ("lse", Stable),
- // FEAT_MTE
+ // FEAT_MTE & FEAT_MTE2
  ("mte", Stable),
  // FEAT_AdvSimd & FEAT_FP
  ("neon", Stable),
@@ -138,7 +138,7 @@ const AARCH64_ALLOWED_FEATURES: &[(&str, Stability)] = &[
  ("pmuv3", Stable),
  // FEAT_RAND
  ("rand", Stable),
- // FEAT_RAS
+ // FEAT_RAS & FEAT_RASv1p1
  ("ras", Stable),
  // FEAT_RCPC
  ("rcpc", Stable),
@@ -156,7 +156,7 @@ const AARCH64_ALLOWED_FEATURES: &[(&str, Stability)] = &[
  ("sm4", Stable),
  // FEAT_SPE
  ("spe", Stable),
- // FEAT_SSBS
+ // FEAT_SSBS & FEAT_SSBS2
  ("ssbs", Stable),
  // FEAT_SVE
  ("sve", Stable),