Enable more tests for simplified lowering after assuming signed for word32.

test/cctest/compiler/test-simplified-lowering.cc

Index: test/cctest/compiler/test-simplified-lowering.cc
diff --git a/test/cctest/compiler/test-simplified-lowering.cc b/test/cctest/compiler/test-simplified-lowering.cc
index 1fcef85a91c92753c7aef292de8b039556e942e8..0416121a1f50587ff820c13f1d2e1a60071584a6 100644
--- a/test/cctest/compiler/test-simplified-lowering.cc
+++ b/test/cctest/compiler/test-simplified-lowering.cc
@@ -1006,13 +1006,10 @@ void CheckChangeInsertion(IrOpcode::Value expected, RepType from, RepType to) {
 
 
 TEST(InsertBasicChanges) {
-  if (false) {
-    // TODO(titzer): these changes need the output to have the right type.
-    CheckChangeInsertion(IrOpcode::kChangeFloat64ToInt32, rFloat64, tInt32);
-    CheckChangeInsertion(IrOpcode::kChangeFloat64ToUint32, rFloat64, tUint32);
-    CheckChangeInsertion(IrOpcode::kChangeTaggedToInt32, rTagged, tInt32);
-    CheckChangeInsertion(IrOpcode::kChangeTaggedToUint32, rTagged, tUint32);
-  }
+  CheckChangeInsertion(IrOpcode::kChangeFloat64ToInt32, rFloat64, tInt32);
+  CheckChangeInsertion(IrOpcode::kChangeFloat64ToUint32, rFloat64, tUint32);
+  CheckChangeInsertion(IrOpcode::kChangeTaggedToInt32, rTagged, tInt32);
+  CheckChangeInsertion(IrOpcode::kChangeTaggedToUint32, rTagged, tUint32);
 
   CheckChangeInsertion(IrOpcode::kChangeFloat64ToTagged, rFloat64, rTagged);
   CheckChangeInsertion(IrOpcode::kChangeTaggedToFloat64, rTagged, rFloat64);