Revert "use unique test source names for test-gen-h"

This reverts commit 264b03d57027da4b7c6e691d9b2a4340cd10fff0.

This workaround is no longer necessary.
6a5c2b249dAndrew Kelley committed on 3/11/2019, 2:35:39 PMparent895fab1
1 file changedLine totals unavailable