Rollup merge of #129421 - jdonszelmann:naked-repr-align-functions, r=workingjubilee,compiler-errors

add repr to the allowlist for naked functions

Fixes #129412 (combining unstable features #90957 (`#![feature(naked_functions)]`) and #82232 (`#![feature(fn_align)]`)

compiler/rustc_passes/src/check_attr.rs

@@ -517,6 +517,7 @@ impl<'tcx> CheckAttrVisitor<'tcx> {
             sym::no_mangle,
             sym::naked,
             sym::instruction_set,
+            sym::repr,
             // code generation
             sym::cold,
             sym::target_feature,