[turbofan] Introduce CheckTaggedSigned and CheckTaggedPointer operators.

test/unittests/compiler/common-operator-unittest.cc

 // Copyright 2014 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 <limits>
 
 #include "src/compiler/common-operator.h"
 #include "src/compiler/opcodes.h"
 #include "src/compiler/operator.h"
 #include "src/compiler/operator-properties.h"
@@ skipping 344 matching lines @@
       const Operator* op1 = common()->NumberConstant(v1);
       const Operator* op2 = common()->NumberConstant(v2);
       EXPECT_EQ(bit_cast<uint64_t>(v1) == bit_cast<uint64_t>(v2),
                 op1->Equals(op2));
     }
   }
 }
 
 
 TEST_F(CommonOperatorTest, BeginRegion) {
-  const Operator* op = common()->BeginRegion();
-  EXPECT_EQ(1, op->EffectInputCount());
-  EXPECT_EQ(1, OperatorProperties::GetTotalInputCount(op));
-  EXPECT_EQ(0, op->ControlOutputCount());
-  EXPECT_EQ(1, op->EffectOutputCount());
-  EXPECT_EQ(0, op->ValueOutputCount());
+  {
+    const Operator* op =
+        common()->BeginRegion(RegionObservability::kObservable);
+    EXPECT_EQ(1, op->EffectInputCount());
+    EXPECT_EQ(1, OperatorProperties::GetTotalInputCount(op));
+    EXPECT_EQ(0, op->ControlOutputCount());
+    EXPECT_EQ(1, op->EffectOutputCount());
+    EXPECT_EQ(0, op->ValueOutputCount());
+  }
+  {
+    const Operator* op =
+        common()->BeginRegion(RegionObservability::kNotObservable);
+    EXPECT_EQ(1, op->EffectInputCount());
+    EXPECT_EQ(1, OperatorProperties::GetTotalInputCount(op));
+    EXPECT_EQ(0, op->ControlOutputCount());
+    EXPECT_EQ(1, op->EffectOutputCount());
+    EXPECT_EQ(0, op->ValueOutputCount());
+  }
 }
 
-
 TEST_F(CommonOperatorTest, FinishRegion) {
   const Operator* op = common()->FinishRegion();
   EXPECT_EQ(1, op->ValueInputCount());
   EXPECT_EQ(1, op->EffectInputCount());
   EXPECT_EQ(2, OperatorProperties::GetTotalInputCount(op));
   EXPECT_EQ(0, op->ControlOutputCount());
   EXPECT_EQ(1, op->EffectOutputCount());
   EXPECT_EQ(1, op->ValueOutputCount());
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8