[turbofan] Drop the obsolete TypeGuard operator.

test/unittests/compiler/js-intrinsic-lowering-unittest.cc

 // Copyright 2015 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/compiler/access-builder.h"
 #include "src/compiler/diamond.h"
 #include "src/compiler/js-graph.h"
 #include "src/compiler/js-intrinsic-lowering.h"
 #include "src/compiler/js-operator.h"
 #include "test/unittests/compiler/graph-unittest.h"
@@ skipping 33 matching lines @@
   }
 
   JSOperatorBuilder* javascript() { return &javascript_; }
 
  private:
   JSOperatorBuilder javascript_;
 };
 
 
 // -----------------------------------------------------------------------------
-// %_DoubleLo
-
-
-TEST_F(JSIntrinsicLoweringTest, InlineOptimizedDoubleLo) {
-  Node* const input = Parameter(0);
-  Node* const context = Parameter(1);
-  Node* const effect = graph()->start();
-  Node* const control = graph()->start();
-  Reduction const r = Reduce(
-      graph()->NewNode(javascript()->CallRuntime(Runtime::kInlineDoubleLo, 1),
-                       input, context, effect, control));
-  ASSERT_TRUE(r.Changed());
-  EXPECT_THAT(r.replacement(),
-              IsFloat64ExtractLowWord32(IsTypeGuard(Type::Number(), input, _)));
-}
-
-
-// -----------------------------------------------------------------------------
-// %_DoubleHi
-
-
-TEST_F(JSIntrinsicLoweringTest, InlineOptimizedDoubleHi) {
-  Node* const input = Parameter(0);
-  Node* const context = Parameter(1);
-  Node* const effect = graph()->start();
-  Node* const control = graph()->start();
-  Reduction const r = Reduce(
-      graph()->NewNode(javascript()->CallRuntime(Runtime::kInlineDoubleHi, 1),
-                       input, context, effect, control));
-  ASSERT_TRUE(r.Changed());
-  EXPECT_THAT(r.replacement(), IsFloat64ExtractHighWord32(
-                                   IsTypeGuard(Type::Number(), input, _)));
-}
-
-
-// -----------------------------------------------------------------------------
 // %_IsSmi
 
 
 TEST_F(JSIntrinsicLoweringTest, InlineIsSmi) {
   Node* const input = Parameter(0);
   Node* const context = Parameter(1);
   Node* const effect = graph()->start();
   Node* const control = graph()->start();
   Reduction const r = Reduce(
       graph()->NewNode(javascript()->CallRuntime(Runtime::kInlineIsSmi, 1),
@@ skipping 152 matching lines @@
                             CaptureEq(&if_false0)))))),
           IsMerge(
               IsIfTrue(AllOf(CaptureEq(&branch0),
                              IsBranch(IsObjectIsSmi(input), control))),
               AllOf(CaptureEq(&if_false0), IsIfFalse(CaptureEq(&branch0))))));
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8