Add a flag to disable anchors on `int` et al
Add a flag to disable anchors on `int` et al

Summary:
It's not generally useful to emit anchors on builtin
types like `int` and `float`. It *is* useful to do so when
writing tests or demonstrating the indexer (as in the schema
document). This diff adds a flag, emit_anchors_on_builtins,
that can turn off anchors on builtins.

Reviewers: #core_team, salguarnieri

Reviewed By: #core_team, salguarnieri

Subscribers: #core_team

Differential Revision: https://phabricator-dot-kythe-repo.appspot.com/D1348

benjyw/kythe,legrosbuffle/kythe,kythe/kythe,bzz/kythe,benjyw/kythe,bzz/kythe,kythe/kythe,kythe/kythe,kythe/kythe,benjyw/kythe,legrosbuffle/kythe,legrosbuffle/kythe,legrosbuffle/kythe,benjyw/kythe,benjyw/kythe,legrosbuffle/kythe,kythe/kythe,kythe/kythe,kythe/kythe,bzz/kythe,benjyw/kythe,bzz/kythe,bzz/kythe,legrosbuffle/kythe,benjyw/kythe,kythe/kythe,bzz/kythe,benjyw/kythe,bzz/kythe,legrosbuffle/kythe,bzz/kythe,benjyw/kythe,legrosbuffle/kythe,bzz/kythe,benjyw/kythe,benjyw/kythe,kythe/kythe,legrosbuffle/kythe,benjyw/kythe,bzz/kythe,legrosbuffle/kythe,kythe/kythe,bzz/kythe,kythe/kythe,legrosbuffle/kythe,bzz/kythe