Fix PR tree-optimization/77808, ICE in duplicate_ssa_name_ptr_info, at tree-ssanames.c:630 starting with r240439

[Doug Gilmore]

It looks like my email being sent from my company is being dropped, re sending
via my gmail account.

Doug
________________________________________
From: Doug Gilmore
Sent: Friday, September 30, 2016 6:35 PM
To: gcc-patches@gcc.gnu.org; Christophe Lyon
Subject: Fix PR tree-optimization/77808, ICE in
duplicate_ssa_name_ptr_info, at tree-ssanames.c:630 starting with
r240439

My commit r240439 didn't handle the situation where setting
--param prefetch-latency=0 can cause the prefetch address to
be the same as the original address.  In this case, no
copying of points-to information should be done.

Bootstrapped and regression tested on x86_64-linux, ok for
trunk?

Doug
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