follow rustc_ naming convention

Author: ZuseZ4

compiler/rustc_builtin_macros/src/autodiff.rs

@@ -95,7 +95,7 @@ pub fn expand(
         generics: Generics::default(),
         body: Some(d_body),
     }));
-    let mut tmp = P(ast::NormalAttr::from_ident(Ident::with_dummy_span(sym::autodiff_into)));
+    let mut tmp = P(ast::NormalAttr::from_ident(Ident::with_dummy_span(sym::rustc_autodiff)));
     let mut attr: ast::Attribute = ast::Attribute {
         kind: ast::AttrKind::Normal(tmp.clone()),
         id: ast::AttrId::from_u32(0),

compiler/rustc_codegen_ssa/src/codegen_attrs.rs

@@ -693,11 +693,11 @@ fn check_link_name_xor_ordinal(
 }
 
 fn autodiff_attrs(tcx: TyCtxt<'_>, id: DefId) -> AutoDiffAttrs {
-    let attrs = tcx.get_attrs(id, sym::autodiff_into);
+    let attrs = tcx.get_attrs(id, sym::rustc_autodiff);
 
     let attrs = attrs
         .into_iter()
-        .filter(|attr| attr.name_or_empty() == sym::autodiff_into)
+        .filter(|attr| attr.name_or_empty() == sym::rustc_autodiff)
         .collect::<Vec<_>>();
 
     if !attrs.is_empty() {

compiler/rustc_feature/src/builtin_attrs.rs

@@ -588,8 +588,7 @@ pub const BUILTIN_ATTRIBUTES: &[BuiltinAttribute] = &[
         IMPL_DETAIL,
     ),
     rustc_attr!(rustc_proc_macro_decls, Normal, template!(Word), WarnFollowing, INTERNAL_UNSTABLE),
-    // Autodiff
-    rustc_attr!(autodiff_into, Normal, template!(Word, List: r#""...""#), DuplicatesOk, INTERNAL_UNSTABLE),
+    rustc_attr!(rustc_autodiff, Normal, template!(Word, List: r#""...""#), DuplicatesOk, INTERNAL_UNSTABLE),
 
     rustc_attr!(
         rustc_macro_transparency, Normal,

compiler/rustc_span/src/symbol.rs

@@ -440,7 +440,6 @@ symbols! {
         augmented_assignments,
         auto_traits,
         autodiff,
-        autodiff_into,
         automatically_derived,
         avx,
         avx512_target_feature,
@@ -1375,6 +1374,7 @@ symbols! {
         rustc_allow_incoherent_impl,
         rustc_allowed_through_unstable_modules,
         rustc_attrs,
+        rustc_autodiff,
         rustc_box,
         rustc_builtin_macro,
         rustc_capture_analysis,