Auto merge of #138791 - matthiaskrgr:rollup-ev46cqr, r=matthiaskrgr

Rollup of 9 pull requests

Successful merges:

 - #138364 (ports the compiler test cases to new rust_intrinsic format)
 - #138570 (add `naked_functions_target_feature` unstable feature)
 - #138623 ([bootstrap] Use llvm_runtimes for compiler-rt)
 - #138627 (Autodiff cleanups)
 - #138669 (tests: accept some noise from LLVM 21 in symbols-all-mangled)
 - #138706 (Improve bootstrap git modified path handling)
 - #138709 (Update GCC submodule)
 - #138717 (Add an attribute that makes the spans from a macro edition 2021, and fix pin on edition 2024 with it)
 - #138721 (Use explicit cpu in some asm and codegen tests.)

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

1 files changed, 0 insertions, 6 deletions

diff --git a/compiler/rustc_codegen_ssa/src/codegen_attrs.rs b/compiler/rustc_codegen_ssa/src/codegen_attrs.rs
index d5972b5c9e6..d16d4ed2283 100644
--- a/compiler/rustc_codegen_ssa/src/codegen_attrs.rs
+++ b/compiler/rustc_codegen_ssa/src/codegen_attrs.rs
@@ -790,16 +790,10 @@ fn autodiff_attrs(tcx: TyCtxt<'_>, id: DefId) -> Option<AutoDiffAttrs> {
 
     // check for exactly one autodiff attribute on placeholder functions.
     // There should only be one, since we generate a new placeholder per ad macro.
-    // FIXME(ZuseZ4): re-enable this check. Currently we add multiple, which doesn't cause harm but
-    // looks strange e.g. under cargo-expand.
     let attr = match &attrs[..] {
         [] => return None,
         [attr] => attr,
-        // These two attributes are the same and unfortunately duplicated due to a previous bug.
-        [attr, _attr2] => attr,
         _ => {
-            //FIXME(ZuseZ4): Once we fixed our parser, we should also prohibit the two-attribute
-            //branch above.
             span_bug!(attrs[1].span(), "cg_ssa: rustc_autodiff should only exist once per source");
         }
     };