Reland of [turbofan] Insert dummy values when changing from None 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 1962 matching lines @@
 }
 
 Type* Typer::Visitor::TypeChangeUint32ToFloat64(Node* node) {
   return Type::Intersect(Type::Unsigned32(), Type::UntaggedFloat64(), zone());
 }
 
 Type* Typer::Visitor::TypeChangeUint32ToUint64(Node* node) {
   return Type::Internal();
 }
 
-Type* Typer::Visitor::TypeImpossibleToWord32(Node* node) {
-  return Type::None();
-}
-
-Type* Typer::Visitor::TypeImpossibleToWord64(Node* node) {
-  return Type::None();
-}
-
-Type* Typer::Visitor::TypeImpossibleToFloat32(Node* node) {
-  return Type::None();
-}
-
-Type* Typer::Visitor::TypeImpossibleToFloat64(Node* node) {
-  return Type::None();
-}
-
-Type* Typer::Visitor::TypeImpossibleToTagged(Node* node) {
-  return Type::None();
-}
-
-Type* Typer::Visitor::TypeImpossibleToBit(Node* node) { return Type::None(); }
-
 Type* Typer::Visitor::TypeTruncateFloat64ToFloat32(Node* node) {
   return Type::Intersect(Type::Number(), Type::UntaggedFloat32(), zone());
 }
 
 Type* Typer::Visitor::TypeTruncateFloat64ToWord32(Node* node) {
   return Type::Intersect(Type::Integral32(), Type::UntaggedIntegral32(),
                          zone());
 }
 
 Type* Typer::Visitor::TypeTruncateInt64ToInt32(Node* node) {
@@ skipping 328 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