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

test/compiler-unittests/graph-unittest.cc

Index: test/compiler-unittests/graph-unittest.cc
diff --git a/test/compiler-unittests/graph-unittest.cc b/test/compiler-unittests/graph-unittest.cc
index 1d85e70f162e3bb1720007cc6abe727e86b62870..868faca4c94ce54c0d32c5c7dfef659b3784bb32 100644
--- a/test/compiler-unittests/graph-unittest.cc
+++ b/test/compiler-unittests/graph-unittest.cc
@@ -676,9 +676,11 @@ IS_BINOP_MATCHER(Int32AddWithOverflow)
   Matcher<Node*> Is##Name(const Matcher<Node*>& input_matcher) {             \
     return MakeMatcher(new IsUnopMatcher(IrOpcode::k##Name, input_matcher)); \
   }
-IS_UNOP_MATCHER(ConvertInt64ToInt32)
 IS_UNOP_MATCHER(ChangeFloat64ToInt32)
 IS_UNOP_MATCHER(ChangeInt32ToFloat64)
+IS_UNOP_MATCHER(ChangeInt32ToInt64)
+IS_UNOP_MATCHER(ChangeUint32ToUint64)
+IS_UNOP_MATCHER(TruncateInt64ToInt32)
 #undef IS_UNOP_MATCHER
 
 }  // namespace compiler