Desugar bitwise negation into XOR and kill all UnaryOp stuff.

src/ast.h

Index: src/ast.h
diff --git a/src/ast.h b/src/ast.h
index db8cb2e3676d053f9ac1243d2de596a140c04162..a8b74213adb663dce6c0fb3bad9ae8c45ea8a648 100644
--- a/src/ast.h
+++ b/src/ast.h
@@ -1847,8 +1847,6 @@ class UnaryOperation: public Expression {
  public:
   DECLARE_NODE_TYPE(UnaryOperation)
 
-  virtual bool ResultOverwriteAllowed();
-
   Token::Value op() const { return op_; }
   Expression* expression() const { return expression_; }
   virtual int position() const { return pos_; }
@@ -1856,8 +1854,6 @@ class UnaryOperation: public Expression {
   BailoutId MaterializeTrueId() { return materialize_true_id_; }
   BailoutId MaterializeFalseId() { return materialize_false_id_; }
 
-  TypeFeedbackId UnaryOperationFeedbackId() const { return reuse(id()); }
-
   virtual void RecordToBooleanTypeFeedback(TypeFeedbackOracle* oracle);
 
  protected: