[turbofan] Fix obsolete workaround for type system in simplified lowering.

src/compiler/simplified-lowering.cc

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/compiler/simplified-lowering.h"
 
 #include <limits>
 
 #include "src/base/bits.h"
 #include "src/code-factory.h"
@@ skipping 420 matching lines @@
   }
 
   const Operator* Float64Op(Node* node) {
     return changer_->Float64OperatorFor(node->opcode());
   }
 
   bool CanLowerToInt32Binop(Node* node, MachineTypeUnion use) {
     return BothInputsAre(node, Type::Signed32()) && !CanObserveNonInt32(use);
   }
 
-  bool IsSafeIntAdditiveOperand(Node* node) {
-    Type* type = NodeProperties::GetBounds(node).upper;
-    // TODO(jarin): Unfortunately, bitset types are not subtypes of larger
-    // range types, so we have to explicitly check for Integral32 here
-    // (in addition to the safe integer range). Once we fix subtyping for
-    // ranges, we should simplify this.
-    return type->Is(safe_int_additive_range_) || type->Is(Type::Integral32());
-  }
-
   bool CanLowerToInt32AdditiveBinop(Node* node, MachineTypeUnion use) {
-    return IsSafeIntAdditiveOperand(node->InputAt(0)) &&
-           IsSafeIntAdditiveOperand(node->InputAt(1)) &&
+    return BothInputsAre(node, safe_int_additive_range_) &&
            !CanObserveNonInt32(use);
   }
 
   bool CanLowerToUint32Binop(Node* node, MachineTypeUnion use) {
     return BothInputsAre(node, Type::Unsigned32()) && !CanObserveNonUint32(use);
   }
 
   bool CanLowerToUint32AdditiveBinop(Node* node, MachineTypeUnion use) {
-    return IsSafeIntAdditiveOperand(node->InputAt(0)) &&
-           IsSafeIntAdditiveOperand(node->InputAt(1)) &&
+    return BothInputsAre(node, safe_int_additive_range_) &&
            !CanObserveNonUint32(use);
   }
 
   bool CanObserveNonWord32(MachineTypeUnion use) {
     return (use & ~(kTypeUint32 | kTypeInt32)) != 0;
   }
 
   bool CanObserveNonInt32(MachineTypeUnion use) {
     return (use & (kTypeUint32 | kTypeNumber | kTypeAny)) != 0;
   }
@@ skipping 1131 matching lines @@
 
 void SimplifiedLowering::DoStringLessThanOrEqual(Node* node) {
   node->set_op(machine()->IntLessThanOrEqual());
   node->ReplaceInput(0, StringComparison(node, true));
   node->ReplaceInput(1, jsgraph()->SmiConstant(EQUAL));
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8