[PATCH][testsuite] Fix PR91419

[Richard Biener]

On Tue, 13 Aug 2019, Hans-Peter Nilsson wrote:

> > From: Richard Biener <rguenther@suse.de>
> > Date: Tue, 13 Aug 2019 09:50:34 +0200
> 
> > 2019-08-13  Richard Biener  <rguenther@suse.de>
> > 
> > 	PR testsuite/91419
> > 	* lib/target-supports.exp (natural_alignment_32): Amend target
> > 	list based on BIGGEST_ALIGNMENT.
> > 	(natural_alignment_64): Targets not natural_alignment_32 cannot
> > 	be natural_alignment_64.
> > 	* gcc.dg/tree-ssa/pr91091-2.c: XFAIL for !natural_alignment_32.
> > 	* gcc.dg/tree-ssa/ssa-fre-77.c: Likewise.
> > 	* gcc.dg/tree-ssa/ssa-fre-61.c: Require natural_alignment_32.
> 
> LGTM, thanks.  (Not tested myself but my cris-elf autotester will pick it up.)

Committed.

Thanks,
Richard.