Avoid accessing Isolate in source position logging.

src/objects.h

Index: src/objects.h
diff --git a/src/objects.h b/src/objects.h
index a1a52b6eee75ef4c97542aedafc29f5e99f347b6..a3aa22c42f9dedcfdd6462610f977061f8d285da 100644
--- a/src/objects.h
+++ b/src/objects.h
@@ -5568,6 +5568,9 @@ class AbstractCode : public HeapObject {
   // Return the source position table.
   inline ByteArray* source_position_table();
 
+  // Set the source position table.
+  inline void set_source_position_table(ByteArray* source_position_table);
+
   // Return the exception handler table.
   inline int LookupRangeInHandlerTable(
       int code_offset, int* data, HandlerTable::CatchPrediction* prediction);