[vta, graphite?] propagate degenerate phi nodes into debug stmts

[Alexandre Oliva]

On Jun  6, 2011, Richard Guenther <richard.guenther@gmail.com> wrote:

>> You meant 4.6 stage1, but I missed it.  How's it for 4.7 stage1?
>> Regstrapped on x86_64-linux-gnu and i686-linux-gnu.

> Isn't exactly ICEing for num_ssa_operands/delink_stmt_imm_use.

Uhh.  Looks like I didn't update the patch per your comments before
putting it aside for stage1, after all.  Sorry.

> So, the op_iter_init change is ok, the other two not - they should
> either ICE or work for PHIs (by using FOR_EACH_PHI_OR_STMT_USE
> in them).

The latter is legitimately called for GIMPLE_PHI, so I changed it to use
FOR_EACH_PHI_OR_STMT_USE.  The former was never called for GIMPLE_PHIs,
so I put in an assert there.

Regstrapped on x86_64-linux-gnu and i686-linux-gnu.  Ok?

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-- 
Alexandre Oliva, freedom fighter    http://FSFLA.org/~lxoliva/
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