[compiler] Introduce proper StrictNotEqualStub.

src/code-stubs.h

 // 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.
 
 #ifndef V8_CODE_STUBS_H_
 #define V8_CODE_STUBS_H_
 
 #include "src/allocation.h"
 #include "src/assembler.h"
 #include "src/codegen.h"
@@ skipping 84 matching lines @@
   V(StoreGlobalViaContext)                  \
   V(StoreScriptContextField)                \
   V(StringAdd)                              \
   V(ToBooleanIC)                            \
   V(TransitionElementsKind)                 \
   V(KeyedLoadIC)                            \
   V(LoadIC)                                 \
   /* TurboFanCodeStubs */                   \
   V(StringLength)                           \
   V(StrictEqual)                            \
+  V(StrictNotEqual)                         \
   V(ToBoolean)                              \
   /* IC Handler stubs */                    \
   V(ArrayBufferViewLoadField)               \
   V(LoadConstant)                           \
   V(LoadFastElement)                        \
   V(LoadField)                              \
   V(KeyedLoadSloppyArguments)               \
   V(KeyedStoreSloppyArguments)              \
   V(StoreField)                             \
   V(StoreGlobal)                            \
@@ skipping 520 matching lines @@
 class StrictEqualStub final : public TurboFanCodeStub {
  public:
   explicit StrictEqualStub(Isolate* isolate) : TurboFanCodeStub(isolate) {}
 
   void GenerateAssembly(compiler::CodeStubAssembler* assembler) const final;
 
   DEFINE_CALL_INTERFACE_DESCRIPTOR(Compare);
   DEFINE_CODE_STUB(StrictEqual, TurboFanCodeStub);
 };
 
+class StrictNotEqualStub final : public TurboFanCodeStub {
+ public:
+  explicit StrictNotEqualStub(Isolate* isolate) : TurboFanCodeStub(isolate) {}
+
+  void GenerateAssembly(compiler::CodeStubAssembler* assembler) const final;
+
+  DEFINE_CALL_INTERFACE_DESCRIPTOR(Compare);
+  DEFINE_CODE_STUB(StrictNotEqual, TurboFanCodeStub);
+};
+
 class ToBooleanStub final : public TurboFanCodeStub {
  public:
   explicit ToBooleanStub(Isolate* isolate) : TurboFanCodeStub(isolate) {}
 
   void GenerateAssembly(compiler::CodeStubAssembler* assembler) const final;
 
   DEFINE_CALL_INTERFACE_DESCRIPTOR(ToBoolean);
   DEFINE_CODE_STUB(ToBoolean, TurboFanCodeStub);
 };
 
@@ skipping 2237 matching lines @@
 #undef DEFINE_HYDROGEN_CODE_STUB
 #undef DEFINE_CODE_STUB
 #undef DEFINE_CODE_STUB_BASE
 
 extern Representation RepresentationFromType(Type* type);
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_CODE_STUBS_H_