Rollup merge of #154677 - Darksonn:hwasan-tagged-globals, r=davidtwco

hwaddress: automatically add `-Ctarget-feature=+tagged-globals`

Note that since HWAddressSanitizer is/should be a target modifier, we do not have to worry about whether this LLVM target feature changes the ABI.

Fixes: rust-lang/rust#148185

compiler/rustc_codegen_ssa/src/target_features.rs

@@ -10,7 +10,7 @@
 use rustc_session::lint::builtin::AARCH64_SOFTFLOAT_NEON;
 use rustc_session::parse::feature_err;
 use rustc_span::{Span, Symbol, edit_distance, sym};
-use rustc_target::spec::Arch;
+use rustc_target::spec::{Arch, SanitizerSet};
 use rustc_target::target_features::{RUSTC_SPECIFIC_FEATURES, Stability};
 use smallvec::SmallVec;
 
@@ -460,6 +460,15 @@ pub fn retpoline_features_by_flags(sess: &Session, features: &mut Vec<String>) {
     }
 }
 
+/// Computes the backend target features to be added to account for sanitizer flags.
+pub fn sanitizer_features_by_flags(sess: &Session, features: &mut Vec<String>) {
+    // It's intentional that this is done only for non-kernel version of hwaddress. This matches
+    // clang behavior.
+    if sess.sanitizers().contains(SanitizerSet::HWADDRESS) {
+        features.push("+tagged-globals".into());
+    }
+}
+
 pub(crate) fn provide(providers: &mut Providers) {
     *providers = Providers {
         rust_target_features: |tcx, cnum| {