[turbofan] Add a Simplified::CheckMaps instruction.

src/compiler/typer.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/base/flags.h"
 #include "src/bootstrapper.h"
 #include "src/compiler/graph-reducer.h"
 #include "src/compiler/js-operator.h"
 #include "src/compiler/node.h"
 #include "src/compiler/node-properties.h"
@@ skipping 1766 matching lines @@
 
 
 Bounds Typer::Visitor::TypeChangeBitToBool(Node* node) {
   Bounds arg = Operand(node, 0);
   // TODO(neis): DCHECK(arg.upper->Is(Type::Boolean()));
   return Bounds(ChangeRepresentation(arg.lower, Type::TaggedPointer(), zone()),
                 ChangeRepresentation(arg.upper, Type::TaggedPointer(), zone()));
 }
 
 
+Bounds Typer::Visitor::TypeCheckMaps(Node* node) { return Bounds(); }
+
+
 Bounds Typer::Visitor::TypeAllocate(Node* node) {
   return Bounds(Type::TaggedPointer());
 }
 
 
 Bounds Typer::Visitor::TypeLoadField(Node* node) {
   return Bounds(FieldAccessOf(node->op()).type);
 }
 
 
@@ skipping 569 matching lines @@
       TYPED_ARRAYS(TYPED_ARRAY_CASE)
 #undef TYPED_ARRAY_CASE
     }
   }
   return Type::Constant(value, zone());
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8