Toward a green tools/build.py -cprecompiler -rdart_precompiled:

runtime/vm/object.cc

Index: runtime/vm/object.cc
diff --git a/runtime/vm/object.cc b/runtime/vm/object.cc
index 11de55fb370d6ae092d04b3d981a094e0e1b0343..59ef3d7b3d2b8afa10bf605fb143c18695f292c1 100644
--- a/runtime/vm/object.cc
+++ b/runtime/vm/object.cc
@@ -10362,6 +10362,11 @@ bool LibraryPrefix::LoadLibrary() const {
   }
   ASSERT(is_deferred_load());
   ASSERT(num_imports() == 1);
+  if (Dart::IsRunningPrecompiledCode()) {

[Florian Schneider, 2016/03/01 22:53:44]

Should this be just 

#if defined(DART_PRECOMPILED_RUNTIME)

?

[rmacnak, 2016/03/01 23:03:29]

Issue #25894

+    // The library list was tree-shaken away.
+    this->set_is_loaded();
+    return true;
+  }
   // This is a prefix for a deferred library. If the library is not loaded
   // yet and isn't being loaded, call the library tag handler to schedule
   // loading. Once all outstanding load requests have completed, the embedder