Fix types for SimplifiedLowering.

src/compiler/simplified-lowering.cc

Index: src/compiler/simplified-lowering.cc
diff --git a/src/compiler/simplified-lowering.cc b/src/compiler/simplified-lowering.cc
index 7645addc6971831a859401264bb3e2f0bad81962..0ffbdcc192bdc021bc59942687c3c5c59d81a3c0 100644
--- a/src/compiler/simplified-lowering.cc
+++ b/src/compiler/simplified-lowering.cc
@@ -629,12 +629,13 @@ class RepresentationSelector {
 
       case IrOpcode::kChangeInt32ToInt64:
         return VisitUnop(node, kTypeInt32 | kRepWord32,
-                         kTypeInt64 | kRepWord64);
+                         kTypeInt32 | kRepWord64);
       case IrOpcode::kChangeUint32ToUint64:
         return VisitUnop(node, kTypeUint32 | kRepWord32,
-                         kTypeUint64 | kRepWord64);
+                         kTypeUint32 | kRepWord64);
       case IrOpcode::kTruncateInt64ToInt32:
-        return VisitUnop(node, kTypeInt64 | kRepWord64,
+        // TODO(titzer): Is kTypeInt32 correct here?
+        return VisitUnop(node, kTypeInt32 | kRepWord64,
                          kTypeInt32 | kRepWord32);
 
       case IrOpcode::kChangeInt32ToFloat64: