[turbofan] Avoid using the typer's types in representation inference for phis.

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 ace2e43e2eb32a880801feeb58064c32270e8212..1b752edd3c855138d5f909b38a0308528c53aea6 100644
--- a/test/cctest/compiler/test-simplified-lowering.cc
+++ b/test/cctest/compiler/test-simplified-lowering.cc
@@ -908,7 +908,7 @@ TEST(LowerBooleanToNumber_bit_tagged) {
   t.Return(use);
   t.Lower();
   CHECK_EQ(b, use->InputAt(0)->InputAt(0));
-  CHECK_EQ(IrOpcode::kChangeInt32ToTagged, use->InputAt(0)->opcode());
+  CHECK_EQ(IrOpcode::kChangeUint32ToTagged, use->InputAt(0)->opcode());
 }
 
 
@@ -921,7 +921,7 @@ TEST(LowerBooleanToNumber_tagged_tagged) {
   t.Return(use);
   t.Lower();
   CHECK_EQ(cnv, use->InputAt(0)->InputAt(0));
-  CHECK_EQ(IrOpcode::kChangeInt32ToTagged, use->InputAt(0)->opcode());
+  CHECK_EQ(IrOpcode::kChangeUint32ToTagged, use->InputAt(0)->opcode());
   CHECK_EQ(t.machine()->WordEqual()->opcode(), cnv->opcode());
   CHECK(b == cnv->InputAt(0) || b == cnv->InputAt(1));
   Node* c = t.jsgraph.TrueConstant();