[intrinsics] Kill the %_IsMinusZero intrinsic.

src/ppc/macro-assembler-ppc.cc

Index: src/ppc/macro-assembler-ppc.cc
diff --git a/src/ppc/macro-assembler-ppc.cc b/src/ppc/macro-assembler-ppc.cc
index 3424e9181f1b490659a65996144f4e788abaed4d..fb0f4858dfee54b284a5f8459a65d59af1021f9b 100644
--- a/src/ppc/macro-assembler-ppc.cc
+++ b/src/ppc/macro-assembler-ppc.cc
@@ -2208,25 +2208,6 @@ void MacroAssembler::TestDoubleIsMinusZero(DoubleRegister input,
 #endif
 }
 
-void MacroAssembler::TestHeapNumberIsMinusZero(Register input,
-                                               Register scratch1,
-                                               Register scratch2) {
-#if V8_TARGET_ARCH_PPC64
-  LoadP(scratch1, FieldMemOperand(input, HeapNumber::kValueOffset));
-  rotldi(scratch1, scratch1, 1);
-  cmpi(scratch1, Operand(1));
-#else
-  lwz(scratch1, FieldMemOperand(input, HeapNumber::kExponentOffset));
-  lwz(scratch2, FieldMemOperand(input, HeapNumber::kMantissaOffset));
-  Label done;
-  cmpi(scratch2, Operand::Zero());
-  bne(&done);
-  lis(scratch2, Operand(SIGN_EXT_IMM16(0x8000)));
-  cmp(scratch1, scratch2);
-  bind(&done);
-#endif
-}
-
 void MacroAssembler::TestDoubleSign(DoubleRegister input, Register scratch) {
 #if V8_TARGET_ARCH_PPC64
   MovDoubleToInt64(scratch, input);