[builtins] Migrate Object.keys to CodeStubAssembler builtin.

src/code-stub-assembler.cc

 // Copyright 2016 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 #include "src/code-stub-assembler.h"
 #include "src/code-factory.h"
 #include "src/frames-inl.h"
 #include "src/frames.h"
 
 namespace v8 {
 namespace internal {
@@ skipping 3137 matching lines @@
       Word32And(instance_type, Int32Constant(kShortExternalStringMask)),
       Int32Constant(0));
 }
 
 Node* CodeStubAssembler::IsJSReceiverInstanceType(Node* instance_type) {
   STATIC_ASSERT(LAST_JS_RECEIVER_TYPE == LAST_TYPE);
   return Int32GreaterThanOrEqual(instance_type,
                                  Int32Constant(FIRST_JS_RECEIVER_TYPE));
 }
 
-Node* CodeStubAssembler::IsJSReceiver(Node* object) {
-  STATIC_ASSERT(LAST_JS_OBJECT_TYPE == LAST_TYPE);
-  return IsJSReceiverInstanceType(LoadInstanceType(object));
-}
-
 Node* CodeStubAssembler::IsJSReceiverMap(Node* map) {
-  STATIC_ASSERT(LAST_JS_OBJECT_TYPE == LAST_TYPE);
   return IsJSReceiverInstanceType(LoadMapInstanceType(map));
 }
 
+Node* CodeStubAssembler::IsJSReceiver(Node* object) {
+  return IsJSReceiverMap(LoadMap(object));
+}
+
+Node* CodeStubAssembler::IsJSObjectMap(Node* map) {
+  STATIC_ASSERT(LAST_JS_OBJECT_TYPE == LAST_TYPE);
+  CSA_ASSERT(this, IsMap(map));
+  return Int32GreaterThanOrEqual(LoadMapInstanceType(map),
+                                 Int32Constant(FIRST_JS_OBJECT_TYPE));
+}
+
 Node* CodeStubAssembler::IsJSObject(Node* object) {
-  STATIC_ASSERT(LAST_JS_OBJECT_TYPE == LAST_TYPE);
-  return Int32GreaterThanOrEqual(LoadInstanceType(object),
-                                 Int32Constant(FIRST_JS_RECEIVER_TYPE));
+  return IsJSObjectMap(LoadMap(object));
 }
 
 Node* CodeStubAssembler::IsJSGlobalProxy(Node* object) {
   return Word32Equal(LoadInstanceType(object),
                      Int32Constant(JS_GLOBAL_PROXY_TYPE));
 }
 
 Node* CodeStubAssembler::IsMap(Node* map) {
   return HasInstanceType(map, MAP_TYPE);
 }
@@ skipping 5700 matching lines @@
         formatted.c_str(), TENURED);
     CallRuntime(Runtime::kGlobalPrint, NoContextConstant(),
                 HeapConstant(string));
   }
   CallRuntime(Runtime::kDebugPrint, NoContextConstant(), tagged_value);
 #endif
 }
 
 }  // namespace internal
 }  // namespace v8