[patch i386]: Disable red zone for w64

[Jan Hubicka]

> On Wed, Jun 11, 2008 at 11:35:03AM +0200, Kai Tietz wrote:
> > 2008-06-11  Kai Tietz  <kai.tietz@onevision.com>
> > 
> >         * config/i386/i386.c (ix86_compute_frame_layout): Disable red zone for
> >         w64 abi.
> >         (ix86_expand_prologue): Likewise.
> >         (ix86_force_to_memory): Likewise.
> >         (ix86_free_from_memory): Likewise.
> > 
> > Tested on x86_64-pc-mingw32 without seeing any regressions.
> > Ok for apply to trunk?
> 
> This is wrong, you are compile time punishing all i?86 targets.
> IMHO you should just target_flags |= MASK_NO_RED_ZONE; in
> override_options for the M$ ABI.

Because we need to support mixing both ABIs via attribute, we can't
precompute this.  The extra checks should not be performance critical
and 32bit targets will get them optimized away anyway.

So patch is OK.
Honza
> 
> 	Jakub