Remove unused is_class_scope bit from Scope and ScopeInfo

src/scopes.h

Index: src/scopes.h
diff --git a/src/scopes.h b/src/scopes.h
index fac8a5622d440d1a4a6db537839d297089d77091..1b43f8e393399e152cb389fb737c56f74f150560 100644
--- a/src/scopes.h
+++ b/src/scopes.h
@@ -280,13 +280,6 @@ class Scope: public ZoneObject {
   bool is_block_scope() const { return scope_type_ == BLOCK_SCOPE; }
   bool is_with_scope() const { return scope_type_ == WITH_SCOPE; }
   bool is_arrow_scope() const { return scope_type_ == ARROW_SCOPE; }
-  void tag_as_class_scope() {
-    DCHECK(is_block_scope());
-    block_scope_is_class_scope_ = true;
-  }
-  bool is_class_scope() const {
-    return is_block_scope() && block_scope_is_class_scope_;
-  }
   bool is_declaration_scope() const {
     return is_eval_scope() || is_function_scope() ||
         is_module_scope() || is_script_scope();
@@ -544,8 +537,6 @@ class Scope: public ZoneObject {
 
   // The scope type.
   ScopeType scope_type_;
-  // Some block scopes are tagged as class scopes.
-  bool block_scope_is_class_scope_;
   // If the scope is a function scope, this is the function kind.
   FunctionKind function_kind_;