[Bug debug/89613] ICF disambuigation doesn't work

[jmuizelaar at mozilla dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=89613

--- Comment #2 from Jeff Muizelaar <jmuizelaar at mozilla dot com> ---
The generated asm is:
 500:   31 c0                   xor    %eax,%eax
 502:   e8 29 01 00 00          callq  630 <a>
 507:   89 c2                   mov    %eax,%edx
 509:   31 c0                   xor    %eax,%eax
 50b:   e8 20 01 00 00          callq  630 <a>
 510:   01 d0                   add    %edx,%eax
 512:   c3                      retq

So we're still calling it twice.