[intrinsics] Kill the %_IsMinusZero intrinsic.

src/ppc/macro-assembler-ppc.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_PPC_MACRO_ASSEMBLER_PPC_H_
 #define V8_PPC_MACRO_ASSEMBLER_PPC_H_
 
 #include "src/assembler.h"
 #include "src/bailout-reason.h"
 #include "src/frames.h"
@@ skipping 855 matching lines @@
 
   // Check if a double can be exactly represented as a signed 32-bit integer.
   // CR_EQ in cr7 is set if true.
   void TestDoubleIsInt32(DoubleRegister double_input, Register scratch1,
                          Register scratch2, DoubleRegister double_scratch);
 
   // Check if a double is equal to -0.0.
   // CR_EQ in cr7 holds the result.
   void TestDoubleIsMinusZero(DoubleRegister input, Register scratch1,
                              Register scratch2);
-  void TestHeapNumberIsMinusZero(Register input, Register scratch1,
-                                 Register scratch2);
 
   // Check the sign of a double.
   // CR_LT in cr7 holds the result.
   void TestDoubleSign(DoubleRegister input, Register scratch);
   void TestHeapNumberSign(Register input, Register scratch);
 
   // Try to convert a double to a signed 32-bit integer.
   // CR_EQ in cr7 is set and result assigned if the conversion is exact.
   void TryDoubleToInt32Exact(Register result, DoubleRegister double_input,
                              Register scratch, DoubleRegister double_scratch);
@@ skipping 718 matching lines @@
 #define ACCESS_MASM(masm)    \
   masm->stop(__FILE_LINE__); \
   masm->
 #else
 #define ACCESS_MASM(masm) masm->
 #endif
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_PPC_MACRO_ASSEMBLER_PPC_H_