[turbofan] Introduce CheckTaggedSigned and CheckTaggedPointer operators.

test/unittests/compiler/escape-analysis-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/bit-vector.h"
 #include "src/compiler/escape-analysis.h"
 #include "src/compiler/escape-analysis-reducer.h"
 #include "src/compiler/graph-visualizer.h"
 #include "src/compiler/js-graph.h"
 #include "src/compiler/node-properties.h"
@@ skipping 30 matching lines @@
     graph_reducer.ReduceGraph();
   }
 
   // ---------------------------------Node Creation Helper----------------------
 
   Node* BeginRegion(Node* effect = nullptr) {
     if (!effect) {
       effect = effect_;
     }
 
-    return effect_ = graph()->NewNode(common()->BeginRegion(), effect);
+    return effect_ = graph()->NewNode(
+               common()->BeginRegion(RegionObservability::kObservable), effect);
   }
 
   Node* FinishRegion(Node* value, Node* effect = nullptr) {
     if (!effect) {
       effect = effect_;
     }
     return effect_ = graph()->NewNode(common()->FinishRegion(), value, effect);
   }
 
   Node* Allocate(Node* size, Node* effect = nullptr, Node* control = nullptr) {
@@ skipping 445 matching lines @@
   ASSERT_EQ(object1, NodeProperties::GetValueInput(object_state, 0));
   ASSERT_EQ(object_state, NodeProperties::GetValueInput(object_state, 1));
 
   Node* object_state2 = NodeProperties::GetValueInput(state_values1, 0);
   ASSERT_EQ(object_state, object_state2);
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8