[Bug ipa/65028] [5 Regression] 450.soplex in SPEC CPU 2006 is miscompiled

[hjl.tools at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65028

--- Comment #34 from H.J. Lu <hjl.tools at gmail dot com> ---
propagate_alignment_accross_jump_function seems wrong:

 if (cur.known)
    {    
      if (!dest_lat->alignment.known)
        {
          dest_lat->alignment = cur; 
          return true;
        }

We can't change argument alignment from unknown to know.
We can only reduce argument alignment.  Callee can only
assume the smallest argument alignment passed down from
all callers.