patch to fix PR69461

[Michael Meissner]

On Wed, Feb 03, 2016 at 10:13:21PM -0500, Vladimir Makarov wrote:
> Thanks, Mike.  I found it when trying to fix numerous LRA failures
> on power8.  Reload pass when can not figure out what to do with
> illegitimate address does nothing.  LRA tried still to do something.
> I've made LRA working as reload for this case.  So LRA failures were
> fixed even if fused to wrapper address was believed to be
> illegitimate.
> 
> Still it makes a sense to consider the address legitimate as a lot
> of code in GCC needs this.

Yeah, it was simple thinko on my part.  Segher was trying to track down this as
-flto in particular seemed to trigger this.

-- 
Michael Meissner, IBM
IBM, M/S 2506R, 550 King Street, Littleton, MA 01460-6245, USA
email: meissner@linux.vnet.ibm.com, phone: +1 (978) 899-4797