[turbofan] Introduce CheckTaggedSigned and CheckTaggedPointer operators.

test/unittests/compiler/instruction-selector-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 "test/unittests/compiler/instruction-selector-unittest.h"
 
 #include "src/code-factory.h"
 #include "src/compiler/graph.h"
 #include "src/compiler/schedule.h"
 #include "src/flags.h"
@@ skipping 315 matching lines @@
 
 TARGET_TEST_F(InstructionSelectorTest, ValueEffect) {
   StreamBuilder m1(this, MachineType::Int32(), MachineType::Pointer());
   Node* p1 = m1.Parameter(0);
   m1.Return(m1.Load(MachineType::Int32(), p1, m1.Int32Constant(0)));
   Stream s1 = m1.Build(kAllInstructions);
   StreamBuilder m2(this, MachineType::Int32(), MachineType::Pointer());
   Node* p2 = m2.Parameter(0);
   m2.Return(m2.AddNode(
       m2.machine()->Load(MachineType::Int32()), p2, m2.Int32Constant(0),
-      m2.AddNode(m2.common()->BeginRegion(), m2.graph()->start())));
+      m2.AddNode(m2.common()->BeginRegion(RegionObservability::kObservable),
+                 m2.graph()->start())));
   Stream s2 = m2.Build(kAllInstructions);
   EXPECT_LE(3U, s1.size());
   ASSERT_EQ(s1.size(), s2.size());
   TRACED_FORRANGE(size_t, i, 0, s1.size() - 1) {
     const Instruction* i1 = s1[i];
     const Instruction* i2 = s2[i];
     EXPECT_EQ(i1->arch_opcode(), i2->arch_opcode());
     EXPECT_EQ(i1->InputCount(), i2->InputCount());
     EXPECT_EQ(i1->OutputCount(), i2->OutputCount());
   }
@@ skipping 274 matching lines @@
   EXPECT_EQ(s.ToVreg(context2), s.ToVreg(call_instr->InputAt(14)));
   // Continuation.
 
   EXPECT_EQ(kArchRet, s[index++]->arch_opcode());
   EXPECT_EQ(index, s.size());
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8