[Bug c/100450] Missing ' ' space for '-E' preprocessing output, works with direct compilation

[jakub at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100450

--- Comment #4 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Created attachment 50769
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=50769&action=edit
gcc12-pr100450.patch

Untested fix.