Re-parse the whole script on debug evaluate

This CL changes the {ScopeIterator} to re-parse the whole script instead
of just the immediate function. The result are accurate parent scopes,
which will enable better variable lookup for debug evaluation.

Drive-by: Remove unused IGNORE_NESTED_SCOPES ScopeIterator::Option and
refactor ScopeIteartor::Next.

Change-Id: I6cb9d303fe5f84da4f4b11c6e2057f07c232316c
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1771785Reviewed-by: Yang Guo <yangguo@chromium.org>
Reviewed-by: Simon Zünd <szuend@chromium.org>
Commit-Queue: Simon Zünd <szuend@chromium.org>
Cr-Commit-Position: refs/heads/master@{#63592}

src/debug/debug-scopes.h

@@ -41,7 +41,7 @@ class ScopeIterator {
   static const int kScopeDetailsFunctionIndex = 5;
   static const int kScopeDetailsSize = 6;
 
-  enum Option { DEFAULT, IGNORE_NESTED_SCOPES, COLLECT_NON_LOCALS };
+  enum Option { DEFAULT, COLLECT_NON_LOCALS };
 
   ScopeIterator(Isolate* isolate, FrameInspector* frame_inspector,
                 Option options = DEFAULT);
@@ -120,12 +120,13 @@ class ScopeIterator {
     return frame_inspector_->javascript_frame();
   }
 
+  void AdvanceOneScope();
+  void AdvanceToNonHiddenScope();
+
   int GetSourcePosition();
 
   void TryParseAndRetrieveScopes(ScopeIterator::Option option);
 
-  void RetrieveScopeChain(DeclarationScope* scope);
-
   void UnwrapEvaluationContext();
 
   using Visitor =