[intrinsics] Kill the %_IsMinusZero intrinsic.

src/crankshaft/ppc/lithium-ppc.h

Index: src/crankshaft/ppc/lithium-ppc.h
diff --git a/src/crankshaft/ppc/lithium-ppc.h b/src/crankshaft/ppc/lithium-ppc.h
index 192e328042e20d521bc3ca5709da140fadbb154d..ee6b133dbf5189ec38ea721a719314103ed63066 100644
--- a/src/crankshaft/ppc/lithium-ppc.h
+++ b/src/crankshaft/ppc/lithium-ppc.h
@@ -47,7 +47,6 @@ class LCodeGen;
   V(ClampIToUint8)                           \
   V(ClampTToUint8)                           \
   V(ClassOfTestAndBranch)                    \
-  V(CompareMinusZeroAndBranch)               \
   V(CompareNumericAndBranch)                 \
   V(CmpObjectEqAndBranch)                    \
   V(CmpHoleAndBranch)                        \
@@ -953,22 +952,6 @@ class LCmpHoleAndBranch final : public LControlInstruction<1, 0> {
 };
 
 
-class LCompareMinusZeroAndBranch final : public LControlInstruction<1, 1> {
- public:
-  LCompareMinusZeroAndBranch(LOperand* value, LOperand* temp) {
-    inputs_[0] = value;
-    temps_[0] = temp;
-  }
-
-  LOperand* value() { return inputs_[0]; }
-  LOperand* temp() { return temps_[0]; }
-
-  DECLARE_CONCRETE_INSTRUCTION(CompareMinusZeroAndBranch,
-                               "cmp-minus-zero-and-branch")
-  DECLARE_HYDROGEN_ACCESSOR(CompareMinusZeroAndBranch)
-};
-
-
 class LIsStringAndBranch final : public LControlInstruction<1, 1> {
  public:
   LIsStringAndBranch(LOperand* value, LOperand* temp) {