[compiler] Drop the CompareNilIC.

src/interface-descriptors.h

 // 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.
 
 #ifndef V8_CALL_INTERFACE_DESCRIPTOR_H_
 #define V8_CALL_INTERFACE_DESCRIPTOR_H_
 
 #include "src/assembler.h"
 #include "src/macro-assembler.h"
 
@@ skipping 40 matching lines @@
   V(RegExpConstructResult)                    \
   V(TransitionElementsKind)                   \
   V(AllocateHeapNumber)                       \
   V(AllocateMutableHeapNumber)                \
   V(AllocateInNewSpace)                       \
   V(ArrayConstructorConstantArgCount)         \
   V(ArrayConstructor)                         \
   V(InternalArrayConstructorConstantArgCount) \
   V(InternalArrayConstructor)                 \
   V(Compare)                                  \
-  V(CompareNil)                               \
   V(ToBoolean)                                \
   V(BinaryOp)                                 \
   V(BinaryOpWithAllocationSite)               \
   V(StringAdd)                                \
   V(StringCompare)                            \
   V(Keyed)                                    \
   V(Named)                                    \
   V(CallHandler)                              \
   V(ArgumentAdaptor)                          \
   V(ApiFunction)                              \
@@ skipping 552 matching lines @@
       InternalArrayConstructorDescriptor, CallInterfaceDescriptor)
 };
 
 
 class CompareDescriptor : public CallInterfaceDescriptor {
  public:
   DECLARE_DESCRIPTOR(CompareDescriptor, CallInterfaceDescriptor)
 };
 
 
-class CompareNilDescriptor : public CallInterfaceDescriptor {
- public:
-  DECLARE_DESCRIPTOR(CompareNilDescriptor, CallInterfaceDescriptor)
-};
-
-
 class ToBooleanDescriptor : public CallInterfaceDescriptor {
  public:
   DECLARE_DESCRIPTOR(ToBooleanDescriptor, CallInterfaceDescriptor)
 };
 
 
 class BinaryOpDescriptor : public CallInterfaceDescriptor {
  public:
   DECLARE_DESCRIPTOR(BinaryOpDescriptor, CallInterfaceDescriptor)
 };
@@ skipping 147 matching lines @@
 }  // namespace v8
 
 
 #if V8_TARGET_ARCH_ARM64
 #include "src/arm64/interface-descriptors-arm64.h"
 #elif V8_TARGET_ARCH_ARM
 #include "src/arm/interface-descriptors-arm.h"
 #endif
 
 #endif  // V8_CALL_INTERFACE_DESCRIPTOR_H_