Save/restore more items in cache with incremental compilation

compiler/rustc_codegen_ssa/src/base.rs

@@ -656,6 +656,8 @@ pub fn codegen_crate<B: ExtraBackendMethods>(
                 object: Some(file_name),
                 dwarf_object: None,
                 bytecode: None,
+                assembly: None,
+                llvm_ir: None,
             }
         })
     });