Wrong code and ICEs on valid PRs

[Eric Botcazou]

>   13424

This one is on PA, with a variant on SPARC.  RTX_UNCHANGING_P again.

>   12958

This one is a SPARC back-end bug.  I initially targeted it to 3.5 but was 
told I have no right to do so.

>   13985

Already assigned to Roger.

>   14235

Already assigned to me (patch in testing).

>   14345

Already assigned to Jan.

-- 
Eric Botcazou