Excluding functions with compiler_builtins as builtin functions

Author: dianqk

compiler/rustc_codegen_ssa/src/back/symbol_export.rs

@@ -110,7 +110,7 @@ fn reachable_non_generics_provider(tcx: TyCtxt<'_>, _: LocalCrate) -> DefIdMap<S
             // We have to preserve the symbols of the built-in functions during LTO.
             let is_builtin_fn = is_compiler_builtins
                 && symbol_export_level(tcx, def_id.to_def_id())
-                    .is_below_threshold(SymbolExportLevel::C);
+                    .is_below_threshold(SymbolExportLevel::C) && name.contains("compiler_builtins");
             let used = name == "rust_eh_personality";
 
             let export_level = if special_runtime_crate {