Desugar bitwise negation into XOR and kill all UnaryOp stuff.

src/hydrogen.h

Index: src/hydrogen.h
diff --git a/src/hydrogen.h b/src/hydrogen.h
index 47b4caa6e3c3a2bbdb346e1a7e466e23299836f9..6312a52376f50713ac584460634dbf4a63161d28 100644
--- a/src/hydrogen.h
+++ b/src/hydrogen.h
@@ -1550,9 +1550,6 @@ class HGraphBuilder {
                                  ElementsKind kind,
                                  int length);
 
-  HInstruction* BuildUnaryMathOp(
-      HValue* value, Handle<Type> type, Token::Value token);
-
   void BuildCompareNil(
       HValue* value,
       Handle<Type> type,
@@ -1811,7 +1808,6 @@ class HOptimizedGraphBuilder: public HGraphBuilder, public AstVisitor {
   void VisitDelete(UnaryOperation* expr);
   void VisitVoid(UnaryOperation* expr);
   void VisitTypeof(UnaryOperation* expr);
-  void VisitBitNot(UnaryOperation* expr);
   void VisitNot(UnaryOperation* expr);
 
   void VisitComma(BinaryOperation* expr);