supersize: Add Print(idx). Sort subgroups in canned_queries.

tools/binary_size/libsupersize/models.py

Index: tools/binary_size/libsupersize/models.py
diff --git a/tools/binary_size/libsupersize/models.py b/tools/binary_size/libsupersize/models.py
index 6c70c67884513ad6c7cdca254e46c301ca557c19..3d4fe8255caad6d061594402a7387af617d97fd3 100644
--- a/tools/binary_size/libsupersize/models.py
+++ b/tools/binary_size/libsupersize/models.py
@@ -404,6 +404,11 @@ class SymbolGroup(BaseSymbol):
   def IsGroup(self):
     return True
 
+  def SetName(self, full_name, template_name=None, name=None):
+    self.full_name = full_name
+    self.template_name = full_name if template_name is None else template_name
+    self.name = full_name if name is None else name
+
   def IterUniqueSymbols(self):
     """Yields all symbols, but only one from each alias group."""
     seen_aliases_lists = set()