[turbofan] Introduce an ExternalPointer type.

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 <iomanip>
 
 #include "src/base/flags.h"
 #include "src/bootstrapper.h"
@@ skipping 580 matching lines @@
   UNREACHABLE();
   return nullptr;
 }
 
 Type* Typer::Visitor::TypeRetain(Node* node) {
   UNREACHABLE();
   return nullptr;
 }
 
 Type* Typer::Visitor::TypeInt32Constant(Node* node) {
-  double number = OpParameter<int32_t>(node);
-  return Type::Intersect(Type::Range(number, number, zone()),
-                         Type::Integral32(), zone());
+  UNREACHABLE();
+  return nullptr;
 }
 
-
 Type* Typer::Visitor::TypeInt64Constant(Node* node) {
-  // TODO(rossberg): This actually seems to be a PointerConstant so far...
-  return Type::Internal();  // TODO(rossberg): Add int64 bitset type?
+  UNREACHABLE();
+  return nullptr;
 }
 
 Type* Typer::Visitor::TypeRelocatableInt32Constant(Node* node) {
   UNREACHABLE();
   return nullptr;
 }
 
 Type* Typer::Visitor::TypeRelocatableInt64Constant(Node* node) {
   UNREACHABLE();
   return nullptr;
 }
 
 Type* Typer::Visitor::TypeFloat32Constant(Node* node) {
   UNREACHABLE();
   return nullptr;
 }
 
-
 Type* Typer::Visitor::TypeFloat64Constant(Node* node) {
   UNREACHABLE();
   return nullptr;
 }
 
-
 Type* Typer::Visitor::TypeNumberConstant(Node* node) {
   double number = OpParameter<double>(node);
   return Type::NewConstant(number, zone());
 }
 
 Type* Typer::Visitor::TypeHeapConstant(Node* node) {
   return TypeConstant(OpParameter<Handle<HeapObject>>(node));
 }
 
-
 Type* Typer::Visitor::TypeExternalConstant(Node* node) {
-  return Type::Internal();
+  return Type::ExternalPointer();
 }
 
+Type* Typer::Visitor::TypePointerConstant(Node* node) {
+  return Type::ExternalPointer();
+}
 
 Type* Typer::Visitor::TypeSelect(Node* node) {
   return Type::Union(Operand(node, 1), Operand(node, 2), zone());
 }
 
 Type* Typer::Visitor::TypePhi(Node* node) {
   int arity = node->op()->ValueInputCount();
   Type* type = Operand(node, 0);
   for (int i = 1; i < arity; ++i) {
     type = Type::Union(type, Operand(node, i), zone());
@@ skipping 1083 matching lines @@
 Type* Typer::Visitor::TypeConstant(Handle<Object> value) {
   if (Type::IsInteger(*value)) {
     return Type::Range(value->Number(), value->Number(), zone());
   }
   return Type::NewConstant(value, zone());
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8