dart2js cps_ir: Unary operator improvements

pkg/compiler/lib/src/cps_ir/builtin_operator.dart

 // Copyright (c) 2015, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 library builtin_operator;
 // This is shared by the CPS and Tree IRs.
 // Both cps_ir_nodes and tree_ir_nodes import and re-export this file.
 
 /// An operator supported natively in the CPS and Tree IRs using the
 /// `ApplyBuiltinOperator` instructions.
 ///
@@ skipping 37 matching lines @@
   /// Dart's modulo (`%`) is the same as remainder only when if both arguments
   /// are non-negative.
   NumRemainder,
 
   /// Corresponds to `a ~/ b` when b is non-zero and the result fits in a signed
   /// 32 bit value.
   ///
   /// This case can be compiled to  `(a / b) | 0`.
   NumTruncatingDivideToSigned32,
 
+  /// Corresponds to JavaScript's negation, which converts 0 to -0.0.
+  NumNegate,
+
+  /// Bit inversions, with coercion to uint32.
+  ///
+  /// Compiles to `(~x) >>> 0`.
+  NumBitNot,
+
   /// Concatenates any number of strings.
   ///
   /// Takes any number of arguments, and each argument must be a string.
   ///
   /// Returns the empty string if no arguments are given.
   StringConcatenate,
 
   /// Returns true if the two arguments are the same value, and that value is
   /// not NaN, or if one argument is +0 and the other is -0.
   ///
@@ skipping 92 matching lines @@
   /// Compiles to `object.push(x1, ..., xN)`.
   Push,
 
   /// Remove and return the last item from a native list.
   /// 
   /// Takes no arguments.
   /// 
   /// Compiles to `object.pop()`.
   Pop,
 }