[Bug rtl-optimization/115912] [15 regression] Harfbuzz testsuite fails (mvar_partial_instance test) since r15-1901-g98914f9eba5f19

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115912

--- Comment #12 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
(In reply to Andrew Pinski from comment #11) 
> Note it might also be useful to add dbgcnt.def support to ext-dce.cc. If I
> get a chance I might add it too.

I have a patch which implements this; just testing it right now.