[turbofan] Fix truncation/representation sloppiness wrt. bool/bit.

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 01ad15e21eff01ac4c22306e6efde18618225674..9d45e5b19261c39f5492687aa828588b3a63054c 100644
--- a/src/compiler/simplified-operator-reducer.cc
+++ b/src/compiler/simplified-operator-reducer.cc
@@ -54,8 +54,6 @@ Reduction SimplifiedOperatorReducer::Reduce(Node* node) {
       if (m.IsChangeBitToBool()) return Replace(m.node()->InputAt(0));
       break;
     }
-    case IrOpcode::kChangeWord32ToBit:
-      return ReduceChangeWord32ToBit(node);
     case IrOpcode::kChangeFloat64ToTagged: {
       Float64Matcher m(node->InputAt(0));
       if (m.HasValue()) return ReplaceNumber(m.Value());
@@ -138,17 +136,6 @@ Reduction SimplifiedOperatorReducer::ReduceAnyToBoolean(Node* node) {
 }
 
 
-Reduction SimplifiedOperatorReducer::ReduceChangeWord32ToBit(Node* node) {
-  Node* const input = NodeProperties::GetValueInput(node, 0);
-  Type* const input_type = NodeProperties::GetBounds(input).upper;
-  if (input_type->Is(jsgraph()->ZeroOneRangeType())) {
-    // ChangeWord32ToBit(x:bit) => x
-    return Replace(input);
-  }
-  return NoChange();
-}
-
-
 Reduction SimplifiedOperatorReducer::Change(Node* node, const Operator* op,
                                             Node* a) {
   DCHECK_EQ(node->InputCount(), OperatorProperties::GetTotalInputCount(op));