Revert of Wrap ClassLiterals in DoExpressions instead of giving them BlockScopes.

src/full-codegen/full-codegen.h

 // Copyright 2012 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.
 
 #ifndef V8_FULL_CODEGEN_FULL_CODEGEN_H_
 #define V8_FULL_CODEGEN_FULL_CODEGEN_H_
 
 #include "src/allocation.h"
 #include "src/assert-scope.h"
 #include "src/ast/ast.h"
@@ skipping 183 matching lines @@
 
     NestedStatement* Exit(int* context_length) override {
       auto block_scope = statement()->AsBlock()->scope();
       if (block_scope != nullptr) {
         if (block_scope->ContextLocalCount() > 0) ++(*context_length);
       }
       return previous_;
     }
   };
 
+  // A class literal expression
+  class NestedClassLiteral : public NestedStatement {
+   public:
+    NestedClassLiteral(FullCodeGenerator* codegen, ClassLiteral* lit)
+        : NestedStatement(codegen),
+          needs_context_(lit->scope() != nullptr &&
+                         lit->scope()->NeedsContext()) {}
+
+    NestedStatement* Exit(int* context_length) override {
+      if (needs_context_) ++(*context_length);
+      return previous_;
+    }
+
+   private:
+    const bool needs_context_;
+  };
+
   class DeferredCommands {
    public:
     enum Command { kReturn, kThrow, kBreak, kContinue };
     typedef int TokenId;
     struct DeferredCommand {
       Command command;
       TokenId token;
       Statement* target;
     };
 
@@ skipping 824 matching lines @@
   Address start_;
   Address instruction_start_;
   uint32_t length_;
 };
 
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_FULL_CODEGEN_FULL_CODEGEN_H_