Auto merge of #144678 - jdonszelmann:no-mangle-extern, r=bjorn3

Make no_mangle on foreign items explicit instead of implicit

for a followup PR I'm working on I need some foreign items to mangle. I could add a new attribute: `no_no_mangle` or something silly like that but by explicitly putting `no_mangle` in the codegen fn attrs of foreign items we can default it to `no_mangle` and then easily remove it when we don't want it.

I guess you'd know about this r? `@bjorn3.` Shouldn't be too hard to review :)

Builds on rust-lang/rust#144655 which should merge first.

Author: bors

src/bin/miri.rs

@@ -279,7 +279,7 @@ impl rustc_driver::Callbacks for MiriBeRustCompilerCalls {
                                 return None;
                             }
                             let codegen_fn_attrs = tcx.codegen_fn_attrs(local_def_id);
-                            if codegen_fn_attrs.contains_extern_indicator()
+                            if codegen_fn_attrs.contains_extern_indicator(tcx, local_def_id.into())
                                 || codegen_fn_attrs
                                     .flags
                                     .contains(CodegenFnAttrFlags::USED_COMPILER)

src/helpers.rs

@@ -132,7 +132,7 @@ pub fn iter_exported_symbols<'tcx>(
     for def_id in crate_items.definitions() {
         let exported = tcx.def_kind(def_id).has_codegen_attrs() && {
             let codegen_attrs = tcx.codegen_fn_attrs(def_id);
-            codegen_attrs.contains_extern_indicator()
+            codegen_attrs.contains_extern_indicator(tcx, def_id.into())
                 || codegen_attrs.flags.contains(CodegenFnAttrFlags::RUSTC_STD_INTERNAL_SYMBOL)
                 || codegen_attrs.flags.contains(CodegenFnAttrFlags::USED_COMPILER)
                 || codegen_attrs.flags.contains(CodegenFnAttrFlags::USED_LINKER)