Desugar bitwise negation into XOR and kill all UnaryOp stuff.

src/hydrogen.cc

Index: src/hydrogen.cc
diff --git a/src/hydrogen.cc b/src/hydrogen.cc
index 84e6a8c54290245472306de55e9088a30f6cb317..8c37900729442f71041bfde6bead492ad21d09d8 100644
--- a/src/hydrogen.cc
+++ b/src/hydrogen.cc
@@ -1717,19 +1717,6 @@ HValue* HGraphBuilder::BuildCloneShallowArray(HValue* boilerplate,
 }
 
 
-HInstruction* HGraphBuilder::BuildUnaryMathOp(
-    HValue* input, Handle<Type> type, Token::Value operation) {
-  ASSERT_EQ(Token::BIT_NOT, operation);
-  // We only handle the numeric cases here
-  type = handle(
-      Type::Intersect(type, handle(Type::Number(), isolate())), isolate());
-  if (type->Is(Type::None())) {
-    Add<HDeoptimize>(Deoptimizer::SOFT);
-  }
-  return New<HBitNot>(input);
-}
-
-
 void HGraphBuilder::BuildCompareNil(
     HValue* value,
     Handle<Type> type,
@@ -7227,7 +7214,6 @@ void HOptimizedGraphBuilder::VisitUnaryOperation(UnaryOperation* expr) {
     case Token::DELETE: return VisitDelete(expr);
     case Token::VOID: return VisitVoid(expr);
     case Token::TYPEOF: return VisitTypeof(expr);
-    case Token::BIT_NOT: return VisitBitNot(expr);
     case Token::NOT: return VisitNot(expr);
     default: UNREACHABLE();
   }
@@ -7289,15 +7275,6 @@ void HOptimizedGraphBuilder::VisitTypeof(UnaryOperation* expr) {
 }
 
 
-void HOptimizedGraphBuilder::VisitBitNot(UnaryOperation* expr) {
-  CHECK_ALIVE(VisitForValue(expr->expression()));
-  Handle<Type> operand_type = expr->expression()->bounds().lower;
-  HValue* value = TruncateToNumber(Pop(), &operand_type);
-  HInstruction* instr = BuildUnaryMathOp(value, operand_type, Token::BIT_NOT);
-  return ast_context()->ReturnInstruction(instr, expr->id());
-}
-
-
 void HOptimizedGraphBuilder::VisitNot(UnaryOperation* expr) {
   if (ast_context()->IsTest()) {
     TestContext* context = TestContext::cast(ast_context());