[turbofan] Introduce CheckTaggedSigned and CheckTaggedPointer operators.

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

Index: test/unittests/compiler/common-operator-unittest.cc
diff --git a/test/unittests/compiler/common-operator-unittest.cc b/test/unittests/compiler/common-operator-unittest.cc
index 0a55a2e2a2d4659d62fdebdf8371fc5b565f8a19..440359e3b5c6e9bfa4daef9f5390c3a27618400b 100644
--- a/test/unittests/compiler/common-operator-unittest.cc
+++ b/test/unittests/compiler/common-operator-unittest.cc
@@ -362,15 +362,26 @@ TEST_F(CommonOperatorTest, NumberConstant) {
 
 
 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());