[Bug rtl-optimization/78561] Constant pool size (offset) can become stale where constant pool entires become unused

[segher at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78561

--- Comment #17 from Segher Boessenkool <segher at gcc dot gnu.org> ---
(In reply to James Greenhalgh from comment #16)
> Created attachment 40267 [details]
> Proposed Patch
> 
> Would you mind testing the attached to see if it fixes your issue?

Bootstrapped fine, regression suite worked fine.  :-)

> I've bootstrapped it on PowerPC myself without any problems, but that's not
> a strong endorsement of the patch given that I've yet to reproduce your
> failure!

It's still a mystery what causes this.  I use a recentish binutils and
GCC to build with, and you use the old OS versions, that is the only
difference I can see.  How that leads to this difference, I have no idea.