[turbofan] Add the StackSlot operator to turbofan.

test/unittests/compiler/instruction-selector-unittest.cc

Index: test/unittests/compiler/instruction-selector-unittest.cc
diff --git a/test/unittests/compiler/instruction-selector-unittest.cc b/test/unittests/compiler/instruction-selector-unittest.cc
index 89c0a654e947297fddb99cb2aecf18e898803d90..25b61212dff0274fced93a883f31c60841b73ba2 100644
--- a/test/unittests/compiler/instruction-selector-unittest.cc
+++ b/test/unittests/compiler/instruction-selector-unittest.cc
@@ -40,7 +40,7 @@ InstructionSelectorTest::Stream InstructionSelectorTest::StreamBuilder::Build(
                                instruction_blocks);
   SourcePositionTable source_position_table(graph());
   InstructionSelector selector(test_->zone(), node_count, &linkage, &sequence,
-                               schedule, &source_position_table,
+                               schedule, &source_position_table, nullptr,
                                source_position_mode, features);
   selector.SelectInstructions();
   if (FLAG_trace_turbo) {