Avoid accessing Isolate in source position logging.

src/crankshaft/s390/lithium-codegen-s390.cc

Index: src/crankshaft/s390/lithium-codegen-s390.cc
diff --git a/src/crankshaft/s390/lithium-codegen-s390.cc b/src/crankshaft/s390/lithium-codegen-s390.cc
index 9704b813aeb6dc1795a576d7e15203355d02e287..7bb718df7e0d783add4312ba854059408d251bd9 100644
--- a/src/crankshaft/s390/lithium-codegen-s390.cc
+++ b/src/crankshaft/s390/lithium-codegen-s390.cc
@@ -55,9 +55,6 @@ void LCodeGen::FinishCode(Handle<Code> code) {
   DCHECK(is_done());
   code->set_stack_slots(GetTotalFrameSlotCount());
   code->set_safepoint_table_offset(safepoints_.GetCodeOffset());
-  Handle<ByteArray> source_positions =
-      source_position_table_builder_.ToSourcePositionTable();
-  code->set_source_position_table(*source_positions);
   PopulateDeoptimizationData(code);
 }