Reland of [turbofan] Insert dummy values when changing from None type.

src/compiler/typer.cc

Index: src/compiler/typer.cc
diff --git a/src/compiler/typer.cc b/src/compiler/typer.cc
index 6733bd6affeb0592d93cc2b3c607da885f4dae4b..129fde2efd9debedc68da09fb6c98e472130b96e 100644
--- a/src/compiler/typer.cc
+++ b/src/compiler/typer.cc
@@ -1980,28 +1980,6 @@ 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());
 }