vm: Generate 'and' instruction for Smi values.

runtime/lib/integers.dart

Index: runtime/lib/integers.dart
diff --git a/runtime/lib/integers.dart b/runtime/lib/integers.dart
index a7722b06b30d7290d45e957e9cabbca60dccfe23..b86b71cad6a0da13b8183e16be9c577272fcac29 100644
--- a/runtime/lib/integers.dart
+++ b/runtime/lib/integers.dart
@@ -63,6 +63,7 @@ abstract class _IntegerImplementation {
   num remainder(num other) {
     return other._remainderFromInteger(this);
   }
+  int _bitAndFromSmi(int other) native "Integer_bitAndFromInteger";
   int _bitAndFromInteger(int other) native "Integer_bitAndFromInteger";
   int _bitOrFromInteger(int other) native "Integer_bitOrFromInteger";
   int _bitXorFromInteger(int other) native "Integer_bitXorFromInteger";
@@ -412,6 +413,9 @@ class _Smi extends _IntegerImplementation implements int {
   int operator ~() native "Smi_bitNegate";
   int get bitLength native "Smi_bitLength";
 
+  int operator &(int other) => other._bitAndFromSmi(this);
+
+  int _bitAndFromSmi(int other) native "Smi_bitAndFromSmi";
   int _shrFromInt(int other) native "Smi_shrFromInt";
   int _shlFromInt(int other) native "Smi_shlFromInt";
 
@@ -609,6 +613,8 @@ class _Mint extends _IntegerImplementation implements int {
   int operator ~() native "Mint_bitNegate";
   int get bitLength native "Mint_bitLength";
 
+  int _bitAndFromSmi(int other) => _bitAndFromInteger(other);
+
   // Shift by mint exceeds range that can be handled by the VM.
   int _shrFromInt(int other) {
     if (other < 0) {