[compiler] Drop the CompareNilIC.

src/objects.h

 // Copyright 2015 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_OBJECTS_H_
 #define V8_OBJECTS_H_
 
 #include <iosfwd>
 
 #include "src/assert-scope.h"
@@ skipping 4866 matching lines @@
   V(WASM_FUNCTION)
 
 #define IC_KIND_LIST(V) \
   V(LOAD_IC)            \
   V(KEYED_LOAD_IC)      \
   V(CALL_IC)            \
   V(STORE_IC)           \
   V(KEYED_STORE_IC)     \
   V(BINARY_OP_IC)       \
   V(COMPARE_IC)         \
-  V(COMPARE_NIL_IC)     \
   V(TO_BOOLEAN_IC)
 
 #define CODE_KIND_LIST(V) \
   NON_IC_KIND_LIST(V)     \
   IC_KIND_LIST(V)
 
   enum Kind {
 #define DEFINE_CODE_KIND_ENUM(name) name,
     CODE_KIND_LIST(DEFINE_CODE_KIND_ENUM)
 #undef DEFINE_CODE_KIND_ENUM
@@ skipping 93 matching lines @@
   inline bool is_inline_cache_stub();
   inline bool is_debug_stub();
   inline bool is_handler();
   inline bool is_load_stub();
   inline bool is_keyed_load_stub();
   inline bool is_store_stub();
   inline bool is_keyed_store_stub();
   inline bool is_call_stub();
   inline bool is_binary_op_stub();
   inline bool is_compare_ic_stub();
-  inline bool is_compare_nil_ic_stub();
   inline bool is_to_boolean_ic_stub();
   inline bool is_keyed_stub();
   inline bool is_optimized_code();
   inline bool is_wasm_code();
   inline bool embeds_maps_weakly();
 
   inline bool IsCodeStubOrIC();
   inline bool IsJavaScriptCode();
 
   inline void set_raw_kind_specific_flags1(int value);
@@ skipping 5824 matching lines @@
     }
     return value;
   }
 };
 
 
 }  // NOLINT, false-positive due to second-order macros.
 }  // NOLINT, false-positive due to second-order macros.
 
 #endif  // V8_OBJECTS_H_