[compiler] Drop the CompareNilIC.

src/ia32/interface-descriptors-ia32.cc

 // Copyright 2012 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.
 
 #if V8_TARGET_ARCH_IA32
 
 #include "src/interface-descriptors.h"
 
 namespace v8 {
 namespace internal {
@@ skipping 306 matching lines @@
 }
 
 
 void CompareDescriptor::InitializePlatformSpecific(
     CallInterfaceDescriptorData* data) {
   Register registers[] = {edx, eax};
   data->InitializePlatformSpecific(arraysize(registers), registers, NULL);
 }
 
 
-void CompareNilDescriptor::InitializePlatformSpecific(
-    CallInterfaceDescriptorData* data) {
-  Register registers[] = {eax};
-  data->InitializePlatformSpecific(arraysize(registers), registers, NULL);
-}
-
-
 void ToBooleanDescriptor::InitializePlatformSpecific(
     CallInterfaceDescriptorData* data) {
   Register registers[] = {eax};
   data->InitializePlatformSpecific(arraysize(registers), registers, NULL);
 }
 
 
 void BinaryOpDescriptor::InitializePlatformSpecific(
     CallInterfaceDescriptorData* data) {
   Register registers[] = {edx, eax};
@@ skipping 114 matching lines @@
       ecx,  // address of first argument (argv)
       ebx   // the runtime function to call
   };
   data->InitializePlatformSpecific(arraysize(registers), registers);
 }
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_IA32