[stubs] Improve code generation for ToBoolean.

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/code-stub-assembler.h"
@@ skipping 115 matching lines @@
   V(Equal)                                  \
   V(NotEqual)                               \
   V(StrictEqual)                            \
   V(StrictNotEqual)                         \
   V(StringEqual)                            \
   V(StringNotEqual)                         \
   V(StringLessThan)                         \
   V(StringLessThanOrEqual)                  \
   V(StringGreaterThan)                      \
   V(StringGreaterThanOrEqual)               \
-  V(ToBoolean)                              \
   V(ToInteger)                              \
   V(ToLength)                               \
   V(HasProperty)                            \
   V(GetProperty)                            \
   V(LoadICTrampolineTF)                     \
   V(LoadICTF)                               \
   /* IC Handler stubs */                    \
   V(KeyedLoadSloppyArguments)               \
   V(KeyedStoreSloppyArguments)              \
   V(LoadApiGetter)                          \
@@ skipping 779 matching lines @@
 
 class StringGreaterThanOrEqualStub final : public TurboFanCodeStub {
  public:
   explicit StringGreaterThanOrEqualStub(Isolate* isolate)
       : TurboFanCodeStub(isolate) {}
 
   DEFINE_CALL_INTERFACE_DESCRIPTOR(Compare);
   DEFINE_TURBOFAN_CODE_STUB(StringGreaterThanOrEqual, TurboFanCodeStub);
 };
 
-class ToBooleanStub final : public TurboFanCodeStub {
- public:
-  explicit ToBooleanStub(Isolate* isolate) : TurboFanCodeStub(isolate) {}
-
-  DEFINE_CALL_INTERFACE_DESCRIPTOR(TypeConversion);
-  DEFINE_TURBOFAN_UNARY_OP_CODE_STUB(ToBoolean, TurboFanCodeStub);
-};
-
 class ToIntegerStub final : public TurboFanCodeStub {
  public:
   explicit ToIntegerStub(Isolate* isolate) : TurboFanCodeStub(isolate) {}
 
   DEFINE_CALL_INTERFACE_DESCRIPTOR(TypeConversion);
   DEFINE_TURBOFAN_CODE_STUB(ToInteger, TurboFanCodeStub);
 };
 
 class ToLengthStub final : public TurboFanCodeStub {
  public:
@@ skipping 2152 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_