Precompile immutable dependencies on "pub get".

sdk/lib/_internal/pub_generated/lib/src/utils.dart

Index: sdk/lib/_internal/pub_generated/lib/src/utils.dart
diff --git a/sdk/lib/_internal/pub_generated/lib/src/utils.dart b/sdk/lib/_internal/pub_generated/lib/src/utils.dart
index dcaf04417d560df5efb84f6c588b3bcf6a077584..f6e833b0a9f7bf842bb3b97ce095834f67e8a0c5 100644
--- a/sdk/lib/_internal/pub_generated/lib/src/utils.dart
+++ b/sdk/lib/_internal/pub_generated/lib/src/utils.dart
@@ -156,6 +156,11 @@ Set setMinus(Iterable minuend, Iterable subtrahend) {
   minuendSet.removeAll(subtrahend);
   return minuendSet;
 }
+bool overlaps(Set set1, Set set2) {
+  var smaller = set1.length > set2.length ? set1 : set2;
+  var larger = smaller == set1 ? set2 : set1;
+  return smaller.any(larger.contains);
+}
 List ordered(Iterable<Comparable> iter) {
   var list = iter.toList();
   list.sort();