dart2js cps_ir: BuiltinOperation improvements.

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

Index: pkg/compiler/lib/src/cps_ir/builtin_operator.dart
diff --git a/pkg/compiler/lib/src/cps_ir/builtin_operator.dart b/pkg/compiler/lib/src/cps_ir/builtin_operator.dart
index 3b80af447150a6af7c2d8044e53d417cabdf064b..31f815a6c5a57f211dfd4d1673cb4c84582f5514 100644
--- a/pkg/compiler/lib/src/cps_ir/builtin_operator.dart
+++ b/pkg/compiler/lib/src/cps_ir/builtin_operator.dart
@@ -29,6 +29,7 @@ enum BuiltinOperator {
   NumAdd,
   NumSubtract,
   NumMultiply,
+  NumDivide,
   NumAnd,
   NumOr,
   NumXor,
@@ -38,6 +39,22 @@ enum BuiltinOperator {
   NumGt,
   NumGe,
 
+  /// NumShr behaves like JS '>>>' but is valid only when the left is in the
+  /// uint32 range and the right in the range [0, 31].
+  NumShr,
+
+  /// NumRemainder corresponds to JavaScript's `a % b`, and Dart's
+  /// `a.remainder(b)`, except at zero, since JavaScript `1 % 0` is `NaN`.
+  /// 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,
+
   /// Concatenates any number of strings.
   ///
   /// Takes any number of arguments, and each argument must be a string.