[Arm64EC] Only decorate functions with #

compiler/rustc_codegen_llvm/src/consts.rs

@@ -364,7 +364,12 @@ impl<'ll> CodegenCx<'ll, '_> {
 
         if !def_id.is_local() {
             let needs_dll_storage_attr = self.use_dll_storage_attrs
-                && !self.tcx.is_foreign_item(def_id)
+                // If the symbol is a foreign item, then don't automatically apply DLLImport, as
+                // we'll rely on the #[link] attribute instead. BUT, if this is an internal symbol
+                // then it may be generated by the compiler in some crate, so we do need to apply
+                // DLLImport when linking with the MSVC linker.
+                && (!self.tcx.is_foreign_item(def_id)
+                    || (self.sess().target.is_like_msvc && fn_attrs.flags.contains(CodegenFnAttrFlags::RUSTC_STD_INTERNAL_SYMBOL)))
                 // Local definitions can never be imported, so we must not apply
                 // the DLLImport annotation.
                 && !dso_local