Implement Function.prototype.toMethod.

src/factory.cc

Index: src/factory.cc
diff --git a/src/factory.cc b/src/factory.cc
index 5ecdfcfd2f4aec25c94ab22927b53363715b3b59..30571a276effb095ba8148a903fc409c4e10b44c 100644
--- a/src/factory.cc
+++ b/src/factory.cc
@@ -1346,13 +1346,11 @@ Handle<JSObject> Factory::NewFunctionPrototype(Handle<JSFunction> function) {
 }
 
 
-Handle<JSFunction> Factory::NewFunctionFromSharedFunctionInfo(
+Handle<JSFunction> Factory::NewFunctionWithMapFromSharedFunctionInfo(
+    Handle<Map> map,
     Handle<SharedFunctionInfo> info,
     Handle<Context> context,
     PretenureFlag pretenure) {
-  int map_index = Context::FunctionMapIndex(info->strict_mode(),
-                                            info->is_generator());
-  Handle<Map> map(Map::cast(context->native_context()->get(map_index)));
   Handle<JSFunction> result = NewFunction(map, info, context, pretenure);
 
   if (info->ic_age() != isolate()->heap()->global_ic_age()) {
@@ -1397,6 +1395,18 @@ Handle<JSFunction> Factory::NewFunctionFromSharedFunctionInfo(
 }
 
 
+Handle<JSFunction> Factory::NewFunctionFromSharedFunctionInfo(
+    Handle<SharedFunctionInfo> info,
+    Handle<Context> context,
+    PretenureFlag pretenure) {
+  int map_index = Context::FunctionMapIndex(info->strict_mode(),
+                                            info->is_generator());
+  Handle<Map> map(Map::cast(context->native_context()->get(map_index)));
+  return NewFunctionWithMapFromSharedFunctionInfo(
+      map, info, context, pretenure);
+}
+
+
 Handle<ScopeInfo> Factory::NewScopeInfo(int length) {
   Handle<FixedArray> array = NewFixedArray(length, TENURED);
   array->set_map_no_write_barrier(*scope_info_map());