[Bug lto/122430] Call to empty interposable function is optimized away with -flto -fPIC -fsemantic-interposition

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=122430

--- Comment #4 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
t.so.ltrans0.ltrans.128t.dse2:  Deleted dead store: gimple_call <g, NULL>

>From t.so-t.c.056t.local-pure-const1:
```
Function is locally const.
Function found to be const: g/1
Function found to be nothrow: g
```
Which is fine But somehow that information is written out during wpa stage for
the partition of f and used.