[Bug rtl-optimization/106041] [12/13 Regression] infinite loop in fast_dce at -O1 with aarch64

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106041

--- Comment #10 from Richard Biener <rguenth at gcc dot gnu.org> ---
Confirmed, it never finishes word-level iteration.

static void
fast_dce (bool word_level)

{
...
  while (global_changed)
    {
...
    }

IMHO that "fast" DCE should hard-limit the iteration count anyway.  I'm trying
to reduce the testcase based on that.