Rollup merge of rust-lang#72438 - vertexclique:vcq/aarch64-tme-features, r=Amanieu

Enable ARM TME (Transactional Memory Extensions)

Enables ARM TME coming up with LLVM 10. Related ARM TME intrinsics are included by the merge of rust-lang#67900.

Enables: rust-lang/stdarch#855

Author: RalfJung

src/librustc_codegen_llvm/llvm_util.rs

@@ -170,6 +170,7 @@ const AARCH64_WHITELIST: &[(&str, Option<Symbol>)] = &[
     ("fp16", Some(sym::aarch64_target_feature)),
     ("rcpc", Some(sym::aarch64_target_feature)),
     ("dotprod", Some(sym::aarch64_target_feature)),
+    ("tme", 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)),

src/libstd/tests/run-time-detect.rs

@@ -32,6 +32,7 @@ fn aarch64_linux() {
     println!("rdm: {}", is_aarch64_feature_detected!("rdm"));
     println!("rcpc: {}", is_aarch64_feature_detected!("rcpc"));
     println!("dotprod: {}", is_aarch64_feature_detected!("dotprod"));
+    println!("tme: {}", is_aarch64_feature_detected!("tme"));
 }
 
 #[test]