Make non-Module generators only context allocate parameters.

test/debugger/debug/es8/async-function-debug-scopes.js

Index: test/debugger/debug/es8/async-function-debug-scopes.js
diff --git a/test/debugger/debug/es8/async-function-debug-scopes.js b/test/debugger/debug/es8/async-function-debug-scopes.js
index 6d54aea98b2bbefbf17474dcb85b90e79de050fe..172ec8fc5654d90eff5513b508001e0ba36e2527 100644
--- a/test/debugger/debug/es8/async-function-debug-scopes.js
+++ b/test/debugger/debug/es8/async-function-debug-scopes.js
@@ -2,6 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+// Flags: --noalways-opt
+
 var Debug = debug.Debug;
 var global_marker = 7;
 
@@ -400,7 +402,7 @@ await test(
                        debug.ScopeType.Closure,
                        debug.ScopeType.Script,
                        debug.ScopeType.Global], exec_state);
-      CheckScopeContent({a:1, x: 2}, 1, exec_state);
+      CheckScopeContent({a:1}, 1, exec_state);
     },
     result => result());
 
@@ -418,7 +420,7 @@ await test(
                        debug.ScopeType.Script,
                        debug.ScopeType.Global], exec_state);
       CheckScopeContent({e: 'Exception'}, 0, exec_state);
-      CheckScopeContent({a:1, x: 2}, 2, exec_state);
+      CheckScopeContent({a:1}, 2, exec_state);
     },
     result => result());