First simple implementation of class literals in TurboFan.

src/compiler/ast-graph-builder.h

Index: src/compiler/ast-graph-builder.h
diff --git a/src/compiler/ast-graph-builder.h b/src/compiler/ast-graph-builder.h
index 92c8712347f3e410ca341ee145d3928cbd36b7ed..f5c2911e44d608f6de5acf64a1f4d13d4fb7057d 100644
--- a/src/compiler/ast-graph-builder.h
+++ b/src/compiler/ast-graph-builder.h
@@ -37,6 +37,7 @@ class AstGraphBuilder : public StructuredGraphBuilder, public AstVisitor {
   class AstEffectContext;
   class AstValueContext;
   class AstTestContext;
+  class BlockContextScope;
   class BreakableScope;
   class ContextScope;
   class Environment;
@@ -174,6 +175,7 @@ class AstGraphBuilder : public StructuredGraphBuilder, public AstVisitor {
   void VisitForEffect(Expression* expr);
   void VisitForValue(Expression* expr);
   void VisitForValueOrNull(Expression* expr);
+  void VisitForValueOrTheHole(Expression* expr);
   void VisitForValues(ZoneList<Expression*>* exprs);
 
   // Common for all IterationStatement bodies.
@@ -196,6 +198,9 @@ class AstGraphBuilder : public StructuredGraphBuilder, public AstVisitor {
   // Dispatched from VisitForInStatement.
   void VisitForInAssignment(Expression* expr, Node* value);
 
+  // Dispatched from VisitClassLiteral.
+  void VisitClassLiteralContents(ClassLiteral* expr);
+
   // Builds deoptimization for a given node.
   void PrepareFrameState(
       Node* node, BailoutId ast_id,