Remove Object::IsSpecObject, use Object::IsJSReceiver instead.

src/objects-inl.h

Index: src/objects-inl.h
diff --git a/src/objects-inl.h b/src/objects-inl.h
index 0beca26cb239bae35987b762720599f354cc14be..cc364e3fa5efef012cfb859ae49fd481aa241e78 100644
--- a/src/objects-inl.h
+++ b/src/objects-inl.h
@@ -190,12 +190,6 @@ bool Object::IsConstructor() const {
 }
 
 
-bool Object::IsSpecObject() const {
-  return Object::IsHeapObject()
-    && HeapObject::cast(this)->map()->instance_type() >= FIRST_JS_RECEIVER_TYPE;
-}
-
-
 bool Object::IsTemplateInfo() const {
   return IsObjectTemplateInfo() || IsFunctionTemplateInfo();
 }
@@ -2370,7 +2364,7 @@ bool Object::IsStringObjectWithCharacterAt(uint32_t index) {
 
 void Object::VerifyApiCallResultType() {
 #if DEBUG
-  if (!(IsSmi() || IsString() || IsSymbol() || IsSpecObject() ||
+  if (!(IsSmi() || IsString() || IsSymbol() || IsJSReceiver() ||
         IsHeapNumber() || IsSimd128Value() || IsUndefined() || IsTrue() ||
         IsFalse() || IsNull())) {
     FATAL("API call returned invalid object");