Remove unused is_class_scope bit from Scope and ScopeInfo

src/parser.cc

Index: src/parser.cc
diff --git a/src/parser.cc b/src/parser.cc
index b9dcbfd84d11baf66e5b9f51e3f822510e0ed1d1..8f53c257c68e3c2579ece335c0518a19787a243e 100644
--- a/src/parser.cc
+++ b/src/parser.cc
@@ -4421,11 +4421,7 @@ ClassLiteral* Parser::ParseClassLiteral(const AstRawString* name,
     return NULL;
   }
 
-  // Create a block scope which is additionally tagged as class scope; this is
-  // important for resolving variable references to the class name in the strong
-  // mode.
   Scope* block_scope = NewScope(scope_, BLOCK_SCOPE);
-  block_scope->tag_as_class_scope();
   BlockState block_state(&scope_, block_scope);
   scope_->SetLanguageMode(
       static_cast<LanguageMode>(scope_->language_mode() | STRICT_BIT));