Remove separate maps for function instances

src/runtime.cc

Index: src/runtime.cc
diff --git a/src/runtime.cc b/src/runtime.cc
index 4e00b2941db0c159cfacb20ed1a714c28c9c3c99..792a14296c4964fce21b15df2855055db6d0d6b8 100644
--- a/src/runtime.cc
+++ b/src/runtime.cc
@@ -9216,26 +9216,6 @@ RUNTIME_FUNCTION(ObjectPair, Runtime_ResolvePossiblyDirectEval) {
 }
 
 
-RUNTIME_FUNCTION(MaybeObject*, Runtime_SetNewFunctionAttributes) {
-  // This utility adjusts the property attributes for newly created Function
-  // object ("new Function(...)") by changing the map.
-  // All it does is changing the prototype property to enumerable
-  // as specified in ECMA262, 15.3.5.2.
-  HandleScope scope(isolate);
-  ASSERT(args.length() == 1);
-  CONVERT_ARG_HANDLE_CHECKED(JSFunction, func, 0);
-
-  Handle<Map> map = func->shared()->is_classic_mode()
-      ? isolate->function_instance_map()
-      : isolate->strict_mode_function_instance_map();
-
-  ASSERT(func->map()->instance_type() == map->instance_type());
-  ASSERT(func->map()->instance_size() == map->instance_size());
-  func->set_map(*map);
-  return *func;
-}
-
-
 RUNTIME_FUNCTION(MaybeObject*, Runtime_AllocateInNewSpace) {
   // Allocate a block of memory in NewSpace (filled with a filler).
   // Use as fallback for allocation in generated code when NewSpace