[turbofan] Introduce a dedicated CheckBounds operator.

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/compiler/typer.h"
 
 #include "src/base/flags.h"
 #include "src/bootstrapper.h"
 #include "src/compilation-dependencies.h"
 #include "src/compiler/common-operator.h"
@@ skipping 1927 matching lines @@
   Type* arg = Operand(node, 0);
   DCHECK(arg->Is(Type::Boolean()));
   return ChangeRepresentation(arg, Type::UntaggedBit(), zone());
 }
 
 Type* Typer::Visitor::TypeChangeBitToTagged(Node* node) {
   Type* arg = Operand(node, 0);
   return ChangeRepresentation(arg, Type::TaggedPointer(), zone());
 }
 
+Type* Typer::Visitor::TypeCheckBounds(Node* node) {
+  // TODO(bmeurer): We could do better here based on the limit.
+  return Type::Unsigned31();
+}
+
 Type* Typer::Visitor::TypeCheckedUint32ToInt32(Node* node) {
   return Type::Signed32();
 }
 
 Type* Typer::Visitor::TypeCheckedFloat64ToInt32(Node* node) {
   return Type::Signed32();
 }
 
 Type* Typer::Visitor::TypeCheckedTaggedToInt32(Node* node) {
   return Type::Signed32();
@@ skipping 746 matching lines @@
   }
   if (Type::IsInteger(*value)) {
     return Type::Range(value->Number(), value->Number(), zone());
   }
   return Type::Constant(value, zone());
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8