[turbofan] Drop obsolete unused JSStrictNotEqual operator.

src/builtins/builtins-number.cc

Index: src/builtins/builtins-number.cc
diff --git a/src/builtins/builtins-number.cc b/src/builtins/builtins-number.cc
index 90f54efc69d97ba64b6ebeab66eab4551726c468..b324c8261202e9582bde791aeea6e2e9d03550f6 100644
--- a/src/builtins/builtins-number.cc
+++ b/src/builtins/builtins-number.cc
@@ -1603,15 +1603,7 @@ TF_BUILTIN(StrictEqual, CodeStubAssembler) {
   Node* rhs = Parameter(1);
   Node* context = Parameter(2);
 
-  Return(StrictEqual(kDontNegateResult, lhs, rhs, context));
-}
-
-TF_BUILTIN(StrictNotEqual, CodeStubAssembler) {
-  Node* lhs = Parameter(0);
-  Node* rhs = Parameter(1);
-  Node* context = Parameter(2);
-
-  Return(StrictEqual(kNegateResult, lhs, rhs, context));
+  Return(StrictEqual(lhs, rhs, context));
 }
 
 }  // namespace internal