Remove unused 'receiver' field from generators

src/parsing/parser.cc

Index: src/parsing/parser.cc
diff --git a/src/parsing/parser.cc b/src/parsing/parser.cc
index 3fa6b27451d3db083677117ede77cd0024ad7a8d..43a5a48cb7c62123a513046c9d3f16d0d0c507a2 100644
--- a/src/parsing/parser.cc
+++ b/src/parsing/parser.cc
@@ -4476,10 +4476,8 @@ ZoneList<Statement*>* Parser::ParseEagerFunctionBody(
 
       {
         ZoneList<Expression*>* arguments =
-            new (zone()) ZoneList<Expression*>(2, zone());
+            new (zone()) ZoneList<Expression*>(1, zone());
         arguments->Add(factory()->NewThisFunction(pos), zone());
-        arguments->Add(
-            ThisExpression(scope_, factory(), RelocInfo::kNoPosition), zone());
         CallRuntime* allocation = factory()->NewCallRuntime(
             Runtime::kCreateJSGeneratorObject, arguments, pos);