[Bug rtl-optimization/122947] variant of pr117239.c still fails

[aoliva at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=122947

--- Comment #1 from Alexandre Oliva <aoliva at gcc dot gnu.org> ---
Created attachment 62965
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=62965&action=edit
variant of pr117239.c that triggers the problem with pristine trunk

We don't need the cselib improvement to hit the problem, after all.  The
difficulty was that the assignment to global d was invalidating the +16 part of
the argument from the cselib table.  Making d local and enforcing its later use
was enough to get the corresponding arg store for the second call to be
misoptimized out.