Auto merge of #90598 - JohnTitor:rollup-kz1qioz, r=JohnTitor

Rollup of 9 pull requests

Successful merges:

 - #90507 (Suggest `extern crate alloc` when using undeclared module `alloc`)
 - #90530 (Simplify js tester a bit)
 - #90533 (Add note about x86 instruction prefixes in asm! to unstable book)
 - #90537 (Update aarch64 `target_feature` list for LLVM 12.)
 - #90544 (Demote metadata load warning to "info".)
 - #90554 (Clean up some `-Z unstable-options` in tests.)
 - #90556 (Add more text and examples to `carrying_{add|mul}`)
 - #90563 (rustbot allow labels)
 - #90571 (Fix missing bottom border for headings in sidebar)

Failed merges:

r? `@ghost`
`@rustbot` modify labels: rollup

1 files changed, 17 insertions, 8 deletions

diff --git a/compiler/rustc_codegen_ssa/src/target_features.rs b/compiler/rustc_codegen_ssa/src/target_features.rs
index dbffb266be8..caeeb23feb4 100644
--- a/compiler/rustc_codegen_ssa/src/target_features.rs
+++ b/compiler/rustc_codegen_ssa/src/target_features.rs
@@ -36,7 +36,6 @@ const ARM_ALLOWED_FEATURES: &[(&str, Option<Symbol>)] = &[
     ("thumb-mode", Some(sym::arm_target_feature)),
 ];
 
-// Commented features are not available in LLVM 10.0, or have since been renamed
 const AARCH64_ALLOWED_FEATURES: &[(&str, Option<Symbol>)] = &[
     // FEAT_AdvSimd
     ("neon", Some(sym::aarch64_target_feature)),
@@ -67,13 +66,13 @@ const AARCH64_ALLOWED_FEATURES: &[(&str, Option<Symbol>)] = &[
     // FEAT_DIT
     ("dit", Some(sym::aarch64_target_feature)),
     // FEAT_FLAGM
-    // ("flagm", Some(sym::aarch64_target_feature)),
+    ("flagm", Some(sym::aarch64_target_feature)),
     // FEAT_SSBS
     ("ssbs", Some(sym::aarch64_target_feature)),
     // FEAT_SB
     ("sb", Some(sym::aarch64_target_feature)),
     // FEAT_PAUTH
-    // ("pauth", Some(sym::aarch64_target_feature)),
+    ("pauth", Some(sym::aarch64_target_feature)),
     // FEAT_DPB
     ("dpb", Some(sym::aarch64_target_feature)),
     // FEAT_DPB2
@@ -93,11 +92,11 @@ const AARCH64_ALLOWED_FEATURES: &[(&str, Option<Symbol>)] = &[
     // FEAT_I8MM
     ("i8mm", Some(sym::aarch64_target_feature)),
     // FEAT_F32MM
-    // ("f32mm", Some(sym::aarch64_target_feature)),
+    ("f32mm", Some(sym::aarch64_target_feature)),
     // FEAT_F64MM
-    // ("f64mm", Some(sym::aarch64_target_feature)),
+    ("f64mm", Some(sym::aarch64_target_feature)),
     // FEAT_BF16
-    // ("bf16", Some(sym::aarch64_target_feature)),
+    ("bf16", Some(sym::aarch64_target_feature)),
     // FEAT_RAND
     ("rand", Some(sym::aarch64_target_feature)),
     // FEAT_BTI
@@ -116,13 +115,23 @@ const AARCH64_ALLOWED_FEATURES: &[(&str, Option<Symbol>)] = &[
     ("sha3", Some(sym::aarch64_target_feature)),
     // FEAT_SM3 & FEAT_SM4
     ("sm4", Some(sym::aarch64_target_feature)),
+    // FEAT_PAN
+    ("pan", Some(sym::aarch64_target_feature)),
+    // FEAT_LOR
+    ("lor", Some(sym::aarch64_target_feature)),
+    // FEAT_VHE
+    ("vh", Some(sym::aarch64_target_feature)),
+    // FEAT_PMUv3
+    ("pmuv3", Some(sym::aarch64_target_feature)),
+    // FEAT_SPE
+    ("spe", Some(sym::aarch64_target_feature)),
     ("v8.1a", Some(sym::aarch64_target_feature)),
     ("v8.2a", Some(sym::aarch64_target_feature)),
     ("v8.3a", Some(sym::aarch64_target_feature)),
     ("v8.4a", Some(sym::aarch64_target_feature)),
     ("v8.5a", Some(sym::aarch64_target_feature)),
-    // ("v8.6a", Some(sym::aarch64_target_feature)),
-    // ("v8.7a", Some(sym::aarch64_target_feature)),
+    ("v8.6a", Some(sym::aarch64_target_feature)),
+    ("v8.7a", Some(sym::aarch64_target_feature)),
 ];
 
 const X86_ALLOWED_FEATURES: &[(&str, Option<Symbol>)] = &[