Avoid Bigint literals in Dart core library

runtime/lib/typed_data_patch.dart

Index: runtime/lib/typed_data_patch.dart
diff --git a/runtime/lib/typed_data_patch.dart b/runtime/lib/typed_data_patch.dart
index c3df4d4711a1b6e8ce36ab05b45faadec13f78f3..8486611a30febc0f2d9d88e018116d52affc30ae 100644
--- a/runtime/lib/typed_data_patch.dart
+++ b/runtime/lib/typed_data_patch.dart
@@ -3044,17 +3044,19 @@ int _toUint32(int value) {
   return value & 0xFFFFFFFF;
 }
 
+const _uint64Mask = (1 << 64) - 1;

[regis, 2017/07/17 16:45:31]

ditto

[alexmarkov, 2017/07/17 20:21:28]

Done.

+
 int _toInt64(int value) {
   // Avoid bigint mask when possible.
   return (ClassID.getID(value) == ClassID.cidBigint)
-      ? _toInt(value, 0xFFFFFFFFFFFFFFFF)
+      ? _toInt(value, _uint64Mask)
       : value;
 }
 
 int _toUint64(int value) {
   // Avoid bigint mask when possible.
   return (ClassID.getID(value) == ClassID.cidBigint)
-      ? _toInt(value, 0xFFFFFFFFFFFFFFFF)
+      ? _toInt(value, _uint64Mask)
       : value;
 }