[intrinsics] Kill the %_IsMinusZero intrinsic.

src/crankshaft/x64/lithium-x64.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_CRANKSHAFT_X64_LITHIUM_X64_H_
 #define V8_CRANKSHAFT_X64_LITHIUM_X64_H_
 
 #include "src/crankshaft/hydrogen.h"
 #include "src/crankshaft/lithium.h"
 #include "src/crankshaft/lithium-allocator.h"
@@ skipping 29 matching lines @@
   V(CheckInstanceType)                       \
   V(CheckMaps)                               \
   V(CheckMapValue)                           \
   V(CheckNonSmi)                             \
   V(CheckSmi)                                \
   V(CheckValue)                              \
   V(ClampDToUint8)                           \
   V(ClampIToUint8)                           \
   V(ClampTToUint8)                           \
   V(ClassOfTestAndBranch)                    \
-  V(CompareMinusZeroAndBranch)               \
   V(CompareNumericAndBranch)                 \
   V(CmpObjectEqAndBranch)                    \
   V(CmpHoleAndBranch)                        \
   V(CmpMapAndBranch)                         \
   V(CmpT)                                    \
   V(ConstantD)                               \
   V(ConstantE)                               \
   V(ConstantI)                               \
   V(ConstantS)                               \
   V(ConstantT)                               \
@@ skipping 899 matching lines @@
     inputs_[0] = object;
   }
 
   LOperand* object() { return inputs_[0]; }
 
   DECLARE_CONCRETE_INSTRUCTION(CmpHoleAndBranch, "cmp-hole-and-branch")
   DECLARE_HYDROGEN_ACCESSOR(CompareHoleAndBranch)
 };
 
 
-class LCompareMinusZeroAndBranch final : public LControlInstruction<1, 0> {
- public:
-  explicit LCompareMinusZeroAndBranch(LOperand* value) {
-    inputs_[0] = value;
-  }
-
-  LOperand* value() { return inputs_[0]; }
-
-  DECLARE_CONCRETE_INSTRUCTION(CompareMinusZeroAndBranch,
-                               "cmp-minus-zero-and-branch")
-  DECLARE_HYDROGEN_ACCESSOR(CompareMinusZeroAndBranch)
-};
-
-
 class LIsStringAndBranch final : public LControlInstruction<1, 1> {
  public:
   explicit LIsStringAndBranch(LOperand* value, LOperand* temp) {
     inputs_[0] = value;
     temps_[0] = temp;
   }
 
   LOperand* value() { return inputs_[0]; }
   LOperand* temp() { return temps_[0]; }
 
@@ skipping 1752 matching lines @@
   DISALLOW_COPY_AND_ASSIGN(LChunkBuilder);
 };
 
 #undef DECLARE_HYDROGEN_ACCESSOR
 #undef DECLARE_CONCRETE_INSTRUCTION
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_CRANKSHAFT_X64_LITHIUM_X64_H_