[intrinsics] Kill the %_IsMinusZero intrinsic.

src/crankshaft/x64/lithium-x64.h

Index: src/crankshaft/x64/lithium-x64.h
diff --git a/src/crankshaft/x64/lithium-x64.h b/src/crankshaft/x64/lithium-x64.h
index f9c38b28f25272c8cc2c05be0e9df6ee4b7b52c8..6f4ab7ee7695ad336245a2bef9eadea368ffd44b 100644
--- a/src/crankshaft/x64/lithium-x64.h
+++ b/src/crankshaft/x64/lithium-x64.h
@@ -47,7 +47,6 @@ class LCodeGen;
   V(ClampIToUint8)                           \
   V(ClampTToUint8)                           \
   V(ClassOfTestAndBranch)                    \
-  V(CompareMinusZeroAndBranch)               \
   V(CompareNumericAndBranch)                 \
   V(CmpObjectEqAndBranch)                    \
   V(CmpHoleAndBranch)                        \
@@ -967,20 +966,6 @@ class LCmpHoleAndBranch final : public LControlInstruction<1, 0> {
 };
 
 
-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) {