Desugar bitwise negation into XOR and kill all UnaryOp stuff.

src/typing.cc

Index: src/typing.cc
diff --git a/src/typing.cc b/src/typing.cc
index ad4fbdb9efc7cbf5c4337fa37ae4fe6bdf855762..727c104ab5fd77d7f4427447bda7be43a3944f73 100644
--- a/src/typing.cc
+++ b/src/typing.cc
@@ -404,8 +404,6 @@ void AstTyper::VisitUnaryOperation(UnaryOperation* expr) {
   RECURSE(Visit(expr->expression()));
 
   // Collect type feedback.
-  Handle<Type> op_type = oracle()->UnaryType(expr->UnaryOperationFeedbackId());
-  NarrowLowerType(expr->expression(), op_type);
   if (expr->op() == Token::NOT) {
     // TODO(rossberg): only do in test or value context.
     expr->expression()->RecordToBooleanTypeFeedback(oracle());
@@ -419,9 +417,6 @@ void AstTyper::VisitUnaryOperation(UnaryOperation* expr) {
     case Token::VOID:
       NarrowType(expr, Bounds(Type::Undefined(), isolate_));
       break;
-    case Token::BIT_NOT:
-      NarrowType(expr, Bounds(Type::Smi(), Type::Signed32(), isolate_));
-      break;
     case Token::TYPEOF:
       NarrowType(expr, Bounds(Type::InternalizedString(), isolate_));
       break;