[Bug pch/14940] PCH largefile test fails on various platforms

[lh_mouse at 126 dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=14940

--- Comment #63 from LIU Hao <lh_mouse at 126 dot com> ---
Jakub, would you mind backporting
https://gcc.gnu.org/cgit/gcc/commit/?id=f769d22ab685671095525d09ef29eeeed0ae3cee
to 14 and 15 branches?