[runtime] Remove the redundant %_IsObject intrinsic.

src/runtime/runtime.h

 // Copyright 2012 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.
 
 #ifndef V8_RUNTIME_RUNTIME_H_
 #define V8_RUNTIME_RUNTIME_H_
 
 #include "src/allocation.h"
 #include "src/objects.h"
 #include "src/unicode.h"
@@ skipping 469 matching lines @@
   F(DefineAccessorPropertyUnchecked, 5, 1)           \
   F(DefineDataPropertyUnchecked, 4, 1)               \
   F(GetDataProperty, 2, 1)                           \
   F(HasFastPackedElements, 1, 1)                     \
   F(ValueOf, 1, 1)                                   \
   F(SetValueOf, 2, 1)                                \
   F(JSValueGetValue, 1, 1)                           \
   F(HeapObjectGetMap, 1, 1)                          \
   F(MapGetInstanceType, 1, 1)                        \
   F(ObjectEquals, 2, 1)                              \
-  F(IsObject, 1, 1)                                  \
   F(IsSpecObject, 1, 1)                              \
   F(IsStrong, 1, 1)                                  \
   F(ClassOf, 1, 1)                                   \
   F(DefineGetterPropertyUnchecked, 4, 1)             \
   F(DefineSetterPropertyUnchecked, 4, 1)             \
   F(ToObject, 1, 1)                                  \
   F(StrictEquals, 2, 1)                              \
   F(InstanceOf, 2, 1)                                \
   F(HasInPrototypeChain, 2, 1)
 
@@ skipping 748 matching lines @@
 inline bool Runtime::AtomicIsLockFree(uint32_t size) {
   return size == 1 || size == 2 || size == 4;
 }
 
 #endif
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_RUNTIME_RUNTIME_H_