[turbofan] Drop obsolete unused JSStrictNotEqual operator.

test/unittests/compiler/typer-unittest.cc

Index: test/unittests/compiler/typer-unittest.cc
diff --git a/test/unittests/compiler/typer-unittest.cc b/test/unittests/compiler/typer-unittest.cc
index 072e780c790e370620197d97c172ee27bdc8d97f..92a981c28b06fcd9d3e46647eb3e23bdbd8ccc3a 100644
--- a/test/unittests/compiler/typer-unittest.cc
+++ b/test/unittests/compiler/typer-unittest.cc
@@ -356,12 +356,6 @@ TEST_F(TyperTest, TypeJSStrictEqual) {
 }
 
 
-TEST_F(TyperTest, TypeJSStrictNotEqual) {
-  TestBinaryCompareOp(javascript_.StrictNotEqual(CompareOperationHint::kAny),
-                      std::not_equal_to<double>());
-}
-
-
 //------------------------------------------------------------------------------
 // Monotonicity
 
@@ -372,7 +366,6 @@ TEST_F(TyperTest, TypeJSStrictNotEqual) {
 TEST_BINARY_MONOTONICITY(Equal)
 TEST_BINARY_MONOTONICITY(NotEqual)
 TEST_BINARY_MONOTONICITY(StrictEqual)
-TEST_BINARY_MONOTONICITY(StrictNotEqual)
 TEST_BINARY_MONOTONICITY(LessThan)
 TEST_BINARY_MONOTONICITY(GreaterThan)
 TEST_BINARY_MONOTONICITY(LessThanOrEqual)