[Chapel Merge] Fix prediff to actually do the prediff

Branch: refs/heads/main
Revision: 6ece2d6b7ebef957951ae9ea22e7b13323ca290e
Author: jabraham17
Link: Fix prediff to actually do the prediff by jabraham17 · Pull Request #29336 · chapel-lang/chapel · GitHub
Log Message:
Fix prediff to actually do the prediff (#29336)

Fixes a prediff that was not running properly and adds more lines to it

[Not reviewed]

Compare: Comparing bdfa5e8f8b62c87dbd34eee84d3d3016b83ec73c...0017e6c573ebb95d400b65a10218380e7da33cc9 · chapel-lang/chapel · GitHub

Diff:
M test/io/bharshbarg/readTypeEOF.prediff
https://github.com/chapel-lang/chapel/pull/29336.diff