Delete an unused function (#561)
Delete an unused function (#561)

Its callers got deleted in ccfc1e7f69760eef775f93a7d704b640ed3e5169.
quiltdata/quilt-compiler,quiltdata/quilt-compiler,quiltdata/quilt,quiltdata/quilt-compiler,quiltdata/quilt,quiltdata/quilt,quiltdata/quilt,quiltdata/quilt-compiler,quiltdata/quilt