[wasm] New attempt to implement the Int64Lowering of phis.

test/unittests/compiler/graph-unittest.h

Index: test/unittests/compiler/graph-unittest.h
diff --git a/test/unittests/compiler/graph-unittest.h b/test/unittests/compiler/graph-unittest.h
index 9c99992511b828c11f205ff183829c32d95c39aa..31bae6d41545f46593ce1a0f3ad1b8f665fcb74d 100644
--- a/test/unittests/compiler/graph-unittest.h
+++ b/test/unittests/compiler/graph-unittest.h
@@ -29,7 +29,6 @@ class GraphTest : public TestWithContext, public TestWithIsolateAndZone {
   explicit GraphTest(int num_parameters = 1);
   ~GraphTest() override;
 
- protected:
   Node* start() { return graph()->start(); }
   Node* end() { return graph()->end(); }