Port #[link_section] to the new attribute parsing infrastructure

compiler/rustc_attr_parsing/src/context.rs

@@ -22,7 +22,7 @@ use crate::attributes::codegen_attrs::{
 use crate::attributes::confusables::ConfusablesParser;
 use crate::attributes::deprecation::DeprecationParser;
 use crate::attributes::inline::{InlineParser, RustcForceInlineParser};
-use crate::attributes::link_attrs::LinkNameParser;
+use crate::attributes::link_attrs::{LinkNameParser, LinkSectionParser};
 use crate::attributes::lint_helpers::{AsPtrParser, PubTransparentParser};
 use crate::attributes::loop_match::{ConstContinueParser, LoopMatchParser};
 use crate::attributes::must_use::MustUseParser;
@@ -123,6 +123,7 @@ attribute_parsers!(
         Single<ExportNameParser>,
         Single<InlineParser>,
         Single<LinkNameParser>,
+        Single<LinkSectionParser>,
         Single<LoopMatchParser>,
         Single<MayDangleParser>,
         Single<MustUseParser>,