1. Fix the type arguments recursion problem that gets introduced when canonicalization of type argu…

runtime/vm/dart_api_impl.cc

Index: runtime/vm/dart_api_impl.cc
diff --git a/runtime/vm/dart_api_impl.cc b/runtime/vm/dart_api_impl.cc
index 038bfc85e64e7425fde0e191965309f23fc756ca..3ccb68b0504afae84d5d5113035bd7d482f0982d 100644
--- a/runtime/vm/dart_api_impl.cc
+++ b/runtime/vm/dart_api_impl.cc
@@ -1568,6 +1568,11 @@ static Dart_Handle createLibrarySnapshot(Dart_Handle library,
   } else {
     lib ^= Api::UnwrapHandle(library);
   }
+  isolate->heap()->CollectAllGarbage();
+#if defined(DEBUG)
+  FunctionVisitor check_canonical(isolate);
+  isolate->heap()->IterateObjects(&check_canonical);
+#endif  // #if defined(DEBUG).
   ScriptSnapshotWriter writer(buffer, ApiReallocate);
   writer.WriteScriptSnapshot(lib);
   *size = writer.BytesWritten();