[turbofan] Introduce a dedicated Array type.

src/compiler/verifier.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 "src/compiler/verifier.h"
 
 #include <algorithm>
 #include <deque>
 #include <queue>
 #include <sstream>
@@ skipping 584 matching lines @@
 
     case IrOpcode::kJSCreate:
       // Type is Object.
       CheckTypeIs(node, Type::Object());
       break;
     case IrOpcode::kJSCreateArguments:
       // Type is OtherObject.
       CheckTypeIs(node, Type::OtherObject());
       break;
     case IrOpcode::kJSCreateArray:
-      // Type is OtherObject.
-      CheckTypeIs(node, Type::OtherObject());
+      // Type is Array.
+      CheckTypeIs(node, Type::Array());
       break;
     case IrOpcode::kJSCreateClosure:
       // Type is Function.
       CheckTypeIs(node, Type::Function());
       break;
     case IrOpcode::kJSCreateIterResultObject:
       // Type is OtherObject.
       CheckTypeIs(node, Type::OtherObject());
       break;
     case IrOpcode::kJSCreateKeyValueArray:
       // Type is OtherObject.
       CheckTypeIs(node, Type::OtherObject());
       break;
     case IrOpcode::kJSCreateLiteralArray:
+      // Type is Array.
+      CheckTypeIs(node, Type::Array());
+      break;
     case IrOpcode::kJSCreateLiteralObject:
     case IrOpcode::kJSCreateLiteralRegExp:
       // Type is OtherObject.
       CheckTypeIs(node, Type::OtherObject());
       break;
     case IrOpcode::kJSLoadProperty:
       // Type can be anything.
       CheckTypeIs(node, Type::Any());
       CHECK(PropertyAccessOf(node->op()).feedback().IsValid());
       break;
@@ skipping 1129 matching lines @@
          replacement->op()->EffectOutputCount() > 0);
   DCHECK(!NodeProperties::IsFrameStateEdge(edge) ||
          replacement->opcode() == IrOpcode::kFrameState);
 }
 
 #endif  // DEBUG
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8