Changes for if-convert to recognize simple conditional reduction.

[Yuri Rumyantsev]

Hi All,

We implemented enhancement for if-convert phase to recognize the
simplest conditional reduction and to transform it vectorizable form,
e.g. statement
    if (A[i] != 0) num+= 1; will be recognized.
A new test-case is also provided.

Bootstrapping and regression testing did not show any new failures.

Is it OK for trunk?

gcc/ChangeLog:
2014-04-17  Yuri Rumyantsev  <ysrum...@gmail.com>

* tree-if-conv.c (is_cond_scalar_reduction): New function.
(convert_scalar_cond_reduction): Likewise.
(predicate_scalar_phi): Add recognition and transformation
of simple conditioanl reduction to be vectorizable.

gcc/testsuite/ChangeLog:
2014-04-17  Yuri Rumyantsev  <ysrum...@gmail.com>

* gcc.dg/cond-reduc.c: New test.

if-conv-cond-reduc.patch
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