Revert of [turbofan] Remove left-over change bits from ChangeLowering.

src/compiler/typer.cc

Index: src/compiler/typer.cc
diff --git a/src/compiler/typer.cc b/src/compiler/typer.cc
index ba26eea148e31fb7da1f3736215b957b28ff827b..7957425cda17ff30dff2757125953078a1fadba8 100644
--- a/src/compiler/typer.cc
+++ b/src/compiler/typer.cc
@@ -1871,7 +1871,7 @@
   return ChangeRepresentation(arg, Type::UntaggedFloat64(), zone());
 }
 
-Type* Typer::Visitor::TypeChangeInt31ToTaggedSigned(Node* node) {
+Type* Typer::Visitor::TypeChangeInt31ToTagged(Node* node) {
   Type* arg = Operand(node, 0);
   // TODO(neis): DCHECK(arg->Is(Type::Signed31()));
   Type* rep =
@@ -1901,13 +1901,15 @@
   return ChangeRepresentation(arg, Type::Tagged(), zone());
 }
 
-Type* Typer::Visitor::TypeChangeTaggedToBit(Node* node) {
+
+Type* Typer::Visitor::TypeChangeBoolToBit(Node* node) {
   Type* arg = Operand(node, 0);
   // TODO(neis): DCHECK(arg.upper->Is(Type::Boolean()));
   return ChangeRepresentation(arg, Type::UntaggedBit(), zone());
 }
 
-Type* Typer::Visitor::TypeChangeBitToTagged(Node* node) {
+
+Type* Typer::Visitor::TypeChangeBitToBool(Node* node) {
   Type* arg = Operand(node, 0);
   // TODO(neis): DCHECK(arg.upper->Is(Type::Boolean()));
   return ChangeRepresentation(arg, Type::TaggedPointer(), zone());