[turbofan] Drop obsolete unused JSStrictNotEqual operator.

src/compiler/js-operator.cc

Index: src/compiler/js-operator.cc
diff --git a/src/compiler/js-operator.cc b/src/compiler/js-operator.cc
index a8f5692d54d4dce8c42f53895088f7736c4865f3..361cbb8c5a932fdf04eaf110c7a4758d4d224118 100644
--- a/src/compiler/js-operator.cc
+++ b/src/compiler/js-operator.cc
@@ -550,7 +550,6 @@ CompareOperationHint CompareOperationHintOf(const Operator* op) {
   DCHECK(op->opcode() == IrOpcode::kJSEqual ||
          op->opcode() == IrOpcode::kJSNotEqual ||
          op->opcode() == IrOpcode::kJSStrictEqual ||
-         op->opcode() == IrOpcode::kJSStrictNotEqual ||
          op->opcode() == IrOpcode::kJSLessThan ||
          op->opcode() == IrOpcode::kJSGreaterThan ||
          op->opcode() == IrOpcode::kJSLessThanOrEqual ||
@@ -598,7 +597,6 @@ CompareOperationHint CompareOperationHintOf(const Operator* op) {
   V(Equal, Operator::kNoProperties)           \
   V(NotEqual, Operator::kNoProperties)        \
   V(StrictEqual, Operator::kPure)             \
-  V(StrictNotEqual, Operator::kPure)          \
   V(LessThan, Operator::kNoProperties)        \
   V(GreaterThan, Operator::kNoProperties)     \
   V(LessThanOrEqual, Operator::kNoProperties) \