Implement basic code generation for arrow functions

src/parser.h

Index: src/parser.h
diff --git a/src/parser.h b/src/parser.h
index 3e93f3aa682612ed19cc2377039d8ff7b75ac1d5..c3d2a70658762ae15a2e1fed9a4698855e496025 100644
--- a/src/parser.h
+++ b/src/parser.h
@@ -418,6 +418,10 @@ class ParserTraits {
     fni->PushLiteralName(id);
   }
   void PushPropertyName(FuncNameInferrer* fni, Expression* expression);
+  static void InferFunctionName(FuncNameInferrer* fni,
+                                FunctionLiteral* func_to_infer) {
+    fni->AddFunction(func_to_infer);
+  }
 
   static void CheckFunctionLiteralInsideTopLevelObjectLiteral(
       Scope* scope, Expression* value, bool* has_function) {
@@ -528,7 +532,8 @@ class ParserTraits {
   const AstRawString* GetNextSymbol(Scanner* scanner);
 
   Expression* ThisExpression(Scope* scope,
-                             AstNodeFactory<AstConstructionVisitor>* factory);
+                             AstNodeFactory<AstConstructionVisitor>* factory,
+                             int pos = RelocInfo::kNoPosition);
   Literal* ExpressionFromLiteral(
       Token::Value token, int pos, Scanner* scanner,
       AstNodeFactory<AstConstructionVisitor>* factory);