Restore kDeclaration as a condition for temp-zone parsing

This should restore the codeload regression when FLAG_lazy_inner_functions is turned off

BUG=v8:5501

Review-Url: https://codereview.chromium.org/2412483005
Cr-Commit-Position: refs/heads/master@{#40217}

src/parsing/parser.cc

@@ -2652,7 +2652,7 @@ FunctionLiteral* Parser::ParseFunctionLiteral(
   bool use_temp_zone =
       (FLAG_lazy_inner_functions
            ? can_preparse
-           : (allow_lazy() &&
+           : (allow_lazy() && function_type == FunctionLiteral::kDeclaration &&
               eager_compile_hint == FunctionLiteral::kShouldLazyCompile)) &&
       !(FLAG_validate_asm && scope()->IsAsmModule());
   bool is_lazy_inner_function =