Drop target_option_node reconstruction logic.

[Jan Hubicka]

> On Fri, Nov 14, 2014 at 11:13 AM, Jan Hubicka <hubicka@ucw.cz> wrote:
nz
> > Hi,
> > this patch kills lto's code to rebuilt DECL_FUNCTION_SPECIFIC_TARGET from target
> > attributes.  This code was never complete and it should be no-op now when we save
> > tehe target nodes.
> > It also makes free_land_data_in_decl to actually anotate all function bodies with
> > a default option node.  The reason is that when LTOint units, one compiled with
> > default settings and one, say with -msse3, we want ot keep these functions preserved.
> >
> > Incrementally i will proceed with similar changes for optimization nodes.
> >
> > Bootstrapped/regtested ppc64-linux, earlier version tested at x86_64-linux and
> > firefox LTO, OK?
> >
> > Honza
> >
> >         * lto.c (lto_read_decls): Do not rebuild DECL_FUNCTION_SPECIFIC_TARGET.
> >         * tree.c (free_lang_data_in_decl): Annotate all functio nbodies with
> >         DECL_FUNCTION_SPECIFIC_TARGET.
> 
> It caused:
> 
> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63917
This one seems to be abou ifcft change by Zhenqiang?

Honza
> 
> -- 
> H.J.