[stubs] Unify (and optimize) implementation of ToObject.

src/compiler/js-generic-lowering.cc

Index: src/compiler/js-generic-lowering.cc
diff --git a/src/compiler/js-generic-lowering.cc b/src/compiler/js-generic-lowering.cc
index e823b35f57c1df43dc21fb2c34fe36d4fb7b269d..1e7ef6717a990af11d58faaef4b026c40a80b8d5 100644
--- a/src/compiler/js-generic-lowering.cc
+++ b/src/compiler/js-generic-lowering.cc
@@ -307,7 +307,9 @@ void JSGenericLowering::LowerJSToName(Node* node) {
 
 
 void JSGenericLowering::LowerJSToObject(Node* node) {
-  ReplaceWithBuiltinCall(node, Builtins::TO_OBJECT, 1);
+  CallDescriptor::Flags flags = AdjustFrameStatesForCall(node);
+  Callable callable = CodeFactory::ToObject(isolate());
+  ReplaceWithStubCall(node, callable, flags);
 }