[full-codegen] Introduce NestedStatement subclass for class literals.

src/full-codegen/full-codegen.h

Index: src/full-codegen/full-codegen.h
diff --git a/src/full-codegen/full-codegen.h b/src/full-codegen/full-codegen.h
index 5642c0fe886fe5785fc1bc06572005a38016b041..0b71bd6a2e0d08b0cc60f3d1637b472b037dbd4e 100644
--- a/src/full-codegen/full-codegen.h
+++ b/src/full-codegen/full-codegen.h
@@ -211,6 +211,23 @@ class FullCodeGenerator: public AstVisitor {
     }
   };
 
+  // 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 };