[turbofan] Introduce Oddball::to_number_raw and use it for change lowering.

src/objects-inl.h

Index: src/objects-inl.h
diff --git a/src/objects-inl.h b/src/objects-inl.h
index 01c62bb781984597723ed23124a0c63e60e786ae..893beac8fdb6f10de0682dc2ee0e4c3b89387bfc 100644
--- a/src/objects-inl.h
+++ b/src/objects-inl.h
@@ -1909,6 +1909,13 @@ InterceptorInfo* Map::GetIndexedInterceptor() {
       constructor->shared()->get_api_func_data()->indexed_property_handler());
 }
 
+double Oddball::to_number_raw() const {
+  return READ_DOUBLE_FIELD(this, kToNumberRawOffset);
+}
+
+void Oddball::set_to_number_raw(double value) {
+  WRITE_DOUBLE_FIELD(this, kToNumberRawOffset, value);
+}
 
 ACCESSORS(Oddball, to_string, String, kToStringOffset)
 ACCESSORS(Oddball, to_number, Object, kToNumberOffset)