[turbofan] Improve representation selection for Smi checking.

src/compiler/simplified-operator-reducer.cc

Index: src/compiler/simplified-operator-reducer.cc
diff --git a/src/compiler/simplified-operator-reducer.cc b/src/compiler/simplified-operator-reducer.cc
index 991e4fc82d856ba9615ce5b1f55179432be3bcaf..9e30e13c1674b1a4f10ad793ddc41b157162cd40 100644
--- a/src/compiler/simplified-operator-reducer.cc
+++ b/src/compiler/simplified-operator-reducer.cc
@@ -142,27 +142,27 @@ Reduction SimplifiedOperatorReducer::Reduce(Node* node) {
       }
       break;
     }
-    case IrOpcode::kCheckTaggedPointer: {
+    case IrOpcode::kCheckHeapObject: {
       Node* const input = node->InputAt(0);
       if (DecideObjectIsSmi(input) == Decision::kFalse) {
         ReplaceWithValue(node, input);
         return Replace(input);
       }
       NodeMatcher m(input);
-      if (m.IsCheckTaggedPointer()) {
+      if (m.IsCheckHeapObject()) {
         ReplaceWithValue(node, input);
         return Replace(input);
       }
       break;
     }
-    case IrOpcode::kCheckTaggedSigned: {
+    case IrOpcode::kCheckSmi: {
       Node* const input = node->InputAt(0);
       if (DecideObjectIsSmi(input) == Decision::kTrue) {
         ReplaceWithValue(node, input);
         return Replace(input);
       }
       NodeMatcher m(input);
-      if (m.IsCheckTaggedSigned()) {
+      if (m.IsCheckSmi()) {
         ReplaceWithValue(node, input);
         return Replace(input);
       } else if (m.IsConvertTaggedHoleToUndefined()) {