Revert of [turbofan] Introduce TruncateTaggedToBit operator for ToBoolean truncation.

src/compiler/representation-change.cc

Index: src/compiler/representation-change.cc
diff --git a/src/compiler/representation-change.cc b/src/compiler/representation-change.cc
index 5b2dd5299cc9d781ee1abcffe1697a6c7d023a88..c8a00338e2440b3ed6861dbfecddff788921e627 100644
--- a/src/compiler/representation-change.cc
+++ b/src/compiler/representation-change.cc
@@ -482,30 +482,18 @@
   switch (node->opcode()) {
     case IrOpcode::kHeapConstant: {
       Handle<HeapObject> value = OpParameter<Handle<HeapObject>>(node);
-      return jsgraph()->Int32Constant(value->BooleanValue() ? 1 : 0);
+      DCHECK(value.is_identical_to(factory()->true_value()) ||
+             value.is_identical_to(factory()->false_value()));
+      return jsgraph()->Int32Constant(
+          value.is_identical_to(factory()->true_value()) ? 1 : 0);
     }
     default:
       break;
   }
   // Select the correct X -> Bit operator.
   const Operator* op;
-  if (IsWord(output_rep)) {
-    return jsgraph()->graph()->NewNode(machine()->Word32Equal(), node,
-                                       jsgraph()->Int32Constant(0));
-  } else if (output_rep == MachineRepresentation::kFloat32) {
-    node = jsgraph()->graph()->NewNode(machine()->Float32Abs(), node);
-    return jsgraph()->graph()->NewNode(machine()->Float32LessThan(),
-                                       jsgraph()->Float32Constant(0.0), node);
-  } else if (output_rep == MachineRepresentation::kFloat64) {
-    node = jsgraph()->graph()->NewNode(machine()->Float64Abs(), node);
-    return jsgraph()->graph()->NewNode(machine()->Float64LessThan(),
-                                       jsgraph()->Float64Constant(0.0), node);
-  } else if (output_rep == MachineRepresentation::kTagged) {
-    if (output_type->Is(Type::Boolean())) {
-      op = simplified()->ChangeTaggedToBit();
-    } else {
-      op = simplified()->TruncateTaggedToBit();
-    }
+  if (output_rep == MachineRepresentation::kTagged) {
+    op = simplified()->ChangeTaggedToBit();
   } else {
     return TypeError(node, output_rep, output_type,
                      MachineRepresentation::kBit);