[compiler] Drop the CompareNilIC.

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 1220 matching lines @@
         ElementAccess access = ElementAccessOf(node->op());
         ProcessInput(node, 0, UseInfoForBasePointer(access));  // base
         ProcessInput(node, 1, UseInfo::TruncatingWord32());    // index
         ProcessInput(node, 2,
                      TruncatingUseInfoFromRepresentation(
                          access.machine_type.representation()));  // value
         ProcessRemainingInputs(node, 3);
         SetOutput(node, NodeOutputInfo::None());
         break;
       }
-      case IrOpcode::kObjectIsNumber: {
+      case IrOpcode::kObjectIsNumber:
+      case IrOpcode::kObjectIsReceiver:
+      case IrOpcode::kObjectIsSmi:
+      case IrOpcode::kObjectIsUndetectable: {
         ProcessInput(node, 0, UseInfo::AnyTagged());
         SetOutput(node, NodeOutputInfo::Bool());
         break;
-      }
-      case IrOpcode::kObjectIsReceiver: {
-        ProcessInput(node, 0, UseInfo::AnyTagged());
-        SetOutput(node, NodeOutputInfo::Bool());
-        break;
-      }
-      case IrOpcode::kObjectIsSmi: {
-        ProcessInput(node, 0, UseInfo::AnyTagged());
-        SetOutput(node, NodeOutputInfo::Bool());
-        break;
       }
 
       //------------------------------------------------------------------
       // Machine-level operators.
       //------------------------------------------------------------------
       case IrOpcode::kLoad: {
         // TODO(jarin) Eventually, we should get rid of all machine stores
         // from the high-level phases, then this becomes UNREACHABLE.
         LoadRepresentation rep = LoadRepresentationOf(node->op());
         ProcessInput(node, 0, UseInfo::AnyTagged());   // tagged pointer
@@ skipping 643 matching lines @@
   ReplaceEffectUses(node, comparison);
   node->ReplaceInput(0, comparison);
   node->ReplaceInput(1, jsgraph()->SmiConstant(EQUAL));
   node->TrimInputCount(2);
   NodeProperties::ChangeOp(node, machine()->IntLessThanOrEqual());
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8