Precompile immutable globally-installed pub executables.

sdk/lib/_internal/pub/test/global/activate/constraint_test.dart

Index: sdk/lib/_internal/pub/test/global/activate/constraint_test.dart
diff --git a/sdk/lib/_internal/pub/test/global/activate/constraint_test.dart b/sdk/lib/_internal/pub/test/global/activate/constraint_test.dart
index 714e06c57e8b6bf19d2f711fa1665ea78356dc4a..d651709c0b01f9061c4ef6d8315246cfd606db12 100644
--- a/sdk/lib/_internal/pub/test/global/activate/constraint_test.dart
+++ b/sdk/lib/_internal/pub/test/global/activate/constraint_test.dart
@@ -21,7 +21,7 @@ main() {
 
     d.dir(cachePath, [
       d.dir('global_packages', [
-        d.matcherFile('foo.lock', contains('1.0.1'))
+        d.dir('foo', [d.matcherFile('pubspec.lock', contains('1.0.1'))])
       ])
     ]).validate();
   });