[turbofan] Add proper conversion operators for int32<->int64.

test/compiler-unittests/graph-unittest.h

Index: test/compiler-unittests/graph-unittest.h
diff --git a/test/compiler-unittests/graph-unittest.h b/test/compiler-unittests/graph-unittest.h
index 5bc2e7714a0c673a656d606a1b8c84199e4d3918..7a242574c919acd839a82521b22bd833565b4113 100644
--- a/test/compiler-unittests/graph-unittest.h
+++ b/test/compiler-unittests/graph-unittest.h
@@ -94,9 +94,11 @@ Matcher<Node*> IsWord64Equal(const Matcher<Node*>& lhs_matcher,
                              const Matcher<Node*>& rhs_matcher);
 Matcher<Node*> IsInt32AddWithOverflow(const Matcher<Node*>& lhs_matcher,
                                       const Matcher<Node*>& rhs_matcher);
-Matcher<Node*> IsConvertInt64ToInt32(const Matcher<Node*>& input_matcher);
 Matcher<Node*> IsChangeFloat64ToInt32(const Matcher<Node*>& input_matcher);
 Matcher<Node*> IsChangeInt32ToFloat64(const Matcher<Node*>& input_matcher);
+Matcher<Node*> IsChangeInt32ToInt64(const Matcher<Node*>& input_matcher);
+Matcher<Node*> IsChangeUint32ToUint64(const Matcher<Node*>& input_matcher);
+Matcher<Node*> IsTruncateInt64ToInt32(const Matcher<Node*>& input_matcher);
 
 }  //  namespace compiler
 }  //  namespace internal