Preliminary patch for PR23820 and PR24309

[Sebastian Pop]

On 10/12/07, Sebastian Pop <sebpop@gmail.com> wrote:
> Do we have an option to XFAIL ltrans-3.c?  And of course, file an
> optimization PR

As we know that we can fix this optimization PR, and because I still
don't see how to implement a solution for that optimization PR, and
because the patch that I'm attaching, with ltrans-3 XFAIL-ed, passes
bootstrap and test on amd64-linux fixing three ICE PRs 23820, 24309,
and 33766, is the patch okay for trunk?

After this patch, as we won't have other PRs open on the loop
interchange (otherwise ping me on these and I'll give them a look),
would it be possible to enable loop interchange at -O3 or -O2 level?

Thanks,
Sebastian
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