[cleanup] Remove redundant fields from DeclarationDescriptor

src/parsing/parser.h

Index: src/parsing/parser.h
diff --git a/src/parsing/parser.h b/src/parsing/parser.h
index 1ff58572f3f266f9f0b1c17901ca680da33c9152..f865074c7911f82fb1e8ecba3b60f88a921c47f1 100644
--- a/src/parsing/parser.h
+++ b/src/parsing/parser.h
@@ -955,10 +955,6 @@ class Parser : public ParserBase<ParserTraits> {
   bool produce_cached_parse_data() const {
     return compile_options_ == ScriptCompiler::kProduceParserCache;
   }
-  Scope* DeclarationScope(VariableMode mode) {
-    return IsLexicalVariableMode(mode)
-        ? scope_ : scope_->DeclarationScope();
-  }
 
   // All ParseXXX functions take as the last argument an *ok parameter
   // which is set to false if parsing failed; it is unchanged otherwise.
@@ -995,11 +991,9 @@ class Parser : public ParserBase<ParserTraits> {
   struct DeclarationDescriptor {
     enum Kind { NORMAL, PARAMETER };
     Parser* parser;
-    Scope* declaration_scope;
     Scope* scope;
     Scope* hoist_scope;
     VariableMode mode;
-    bool is_const;
     bool needs_init;
     int declaration_pos;
     int initialization_pos;