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

R=mstarzinger@chromium.org
BUG=

Review URL: https://codereview.chromium.org/461933002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@23125 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

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

@@ -1011,17 +1011,13 @@ void CheckChangeInsertion(IrOpcode::Value expected, MachineType from,
 
 
 TEST(InsertBasicChanges) {
-  if (false) {
-    // TODO(titzer): these changes need the output to have the right type.
   CheckChangeInsertion(IrOpcode::kChangeFloat64ToInt32, kRepFloat64,
                        kTypeInt32);
   CheckChangeInsertion(IrOpcode::kChangeFloat64ToUint32, kRepFloat64,
                        kTypeUint32);
-    CheckChangeInsertion(IrOpcode::kChangeTaggedToInt32, kRepTagged,
-                         kTypeInt32);
+  CheckChangeInsertion(IrOpcode::kChangeTaggedToInt32, kRepTagged, kTypeInt32);
   CheckChangeInsertion(IrOpcode::kChangeTaggedToUint32, kRepTagged,
                        kTypeUint32);
-  }
 
   CheckChangeInsertion(IrOpcode::kChangeFloat64ToTagged, kRepFloat64,
                        kRepTagged);