[debugger] make strict eval-scope visible to debugging.

test/mjsunit/es6/debug-scope-default-param-with-eval.js

 // Copyright 2016 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // Flags: --expose-debug-as debug
 
 // Test that the parameter initialization block scope set up for
 // sloppy eval is visible to the debugger.
 
 var Debug = debug.Debug;
 var exception = null;
 var break_count = 0;
 
 function call_for_break() {
   return 5;
 }
 
 function test(x = eval("var y = 7; debugger; y") + call_for_break()) {
   return x;
 }
 
 function listener(event, exec_state, event_data, data) {
   if (event != Debug.DebugEvent.Break) return;
   try {
     var frame = exec_state.frame(0);
-    var top_scope = frame.scope(0);
-    assertTrue(top_scope.scopeObject().propertyNames().includes('y'));
-    assertEquals(7, top_scope.scopeObject().property('y').value().value());
+    var block_scope;
     if (break_count++ == 0) {
       // Inside eval.
-      assertEquals([ debug.ScopeType.Block,
+      assertEquals([ debug.ScopeType.Eval,
+                     debug.ScopeType.Block,
                      debug.ScopeType.Closure,
                      debug.ScopeType.Script,
                      debug.ScopeType.Global ],
                    frame.allScopes().map(s => s.scopeType()));
       exec_state.prepareStep(Debug.StepAction.StepOut);
+      block_scope = frame.scope(1);
     } else {
       // Outside of eval.
       assertEquals([ debug.ScopeType.Block,
                      debug.ScopeType.Local,
                      debug.ScopeType.Script,
                      debug.ScopeType.Global ],
                    frame.allScopes().map(s => s.scopeType()));
+      block_scope = frame.scope(0);
     }
+    assertTrue(block_scope.scopeObject().propertyNames().includes('y'));
+    assertEquals(7, block_scope.scopeObject().property('y').value().value());
   } catch (e) {
+    print(e);
     exception = e;
   }
 }
 
 Debug.setListener(listener);
 
 assertEquals(12, test());
 
 Debug.setListener(null);
 
 assertNull(exception);
 assertEquals(2, break_count);