Revert "[PhaseOrdering] add test for issue #50778; NFC"

This reverts commit cdc012fa2696434689c872abc4797a1ee8284ddf.
This accidentally deleted a test file (not sure how that became
part of the commit).

GitOrigin-RevId: 34f8112b79fa3fd17af018303de22dd83991a87b
1 file changed