[turbofan] Cache conversions inserted during typed lowering.

test/unittests/compiler/js-typed-lowering-unittest.cc

Index: test/unittests/compiler/js-typed-lowering-unittest.cc
diff --git a/test/unittests/compiler/js-typed-lowering-unittest.cc b/test/unittests/compiler/js-typed-lowering-unittest.cc
index d0c465fd34c4f04eab48e4eb65a1919593c46901..884dab3c1e5a2b95be34f014be82c809e527f592 100644
--- a/test/unittests/compiler/js-typed-lowering-unittest.cc
+++ b/test/unittests/compiler/js-typed-lowering-unittest.cc
@@ -46,7 +46,7 @@ class JSTypedLoweringTest : public TypedGraphTest {
   Reduction Reduce(Node* node) {
     MachineOperatorBuilder machine(zone());
     JSGraph jsgraph(graph(), common(), javascript(), &machine);
-    JSTypedLowering reducer(&jsgraph);
+    JSTypedLowering reducer(&jsgraph, zone());
     return reducer.Reduce(node);
   }