Avoid accessing Isolate in source position logging.

test/unittests/interpreter/bytecode-array-writer-unittest.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/v8.h"
 
 #include "src/api.h"
 #include "src/factory.h"
 #include "src/interpreter/bytecode-array-writer.h"
 #include "src/interpreter/bytecode-label.h"
@@ skipping 217 matching lines @@
   Write(Bytecode::kReturn, {85, true});
   CHECK_EQ(max_register_count(), 8);
 #undef R
 
   CHECK_EQ(bytecodes()->size(), arraysize(expected_bytes));
   for (size_t i = 0; i < arraysize(expected_bytes); ++i) {
     CHECK_EQ(static_cast<int>(bytecodes()->at(i)),
              static_cast<int>(expected_bytes[i]));
   }
 
-  Handle<ByteArray> source_positions =
-      source_position_table_builder()->ToSourcePositionTable();
-  SourcePositionTableIterator source_iterator(*source_positions);
+  Handle<BytecodeArray> bytecode_array =
+      writer()->ToBytecodeArray(0, 0, factory()->empty_fixed_array());
+  SourcePositionTableIterator source_iterator(
+      bytecode_array->source_position_table());
   for (size_t i = 0; i < arraysize(expected_positions); ++i) {
     const PositionTableEntry& expected = expected_positions[i];
     CHECK_EQ(source_iterator.code_offset(), expected.code_offset);
     CHECK_EQ(source_iterator.source_position(), expected.source_position);
     CHECK_EQ(source_iterator.is_statement(), expected.is_statement);
     source_iterator.Advance();
   }
   CHECK(source_iterator.done());
 }
 
 }  // namespace interpreter
 }  // namespace internal
 }  // namespace v8