[PATCH] Update preferred_stack_boundary only when expanding function call

[H.J. Lu]

locate_and_pad_parm is called when expanding function call from
initialize_argument_information and when generating function body
from assign_parm_find_entry_rtl:

  /* Remember if the outgoing parameter requires extra alignment on the
     calling function side.  */
  if (crtl->stack_alignment_needed < boundary)
    crtl->stack_alignment_needed = boundary;
  if (crtl->preferred_stack_boundary < boundary)
    crtl->preferred_stack_boundary = boundary;

stack_alignment_needed and preferred_stack_boundary should be updated
only when expanding function call, not when generating function body.
Add an argument, outgoing_p, to locate_and_pad_parm to indicate for
expanding function call.  Update stack_alignment_needed and
preferred_stack_boundary if the parameter is passed on stack and only
when expanding function call.

Tested on Linux/x86-64.

OK for trunk?

Thanks.

-- 
H.J.
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