[patch] PR34445 fix (vectorizer ICE)

[Dorit Nuzman <DORIT at il dot ibm dot com>]

Stmts in the the loop that are "irrelevant" (i.e. don't need to be
vectorized, for various reasons) should not be considered for cost model
analysis, also if they are "live" (used out of the loop). What happens in
this PR is that during cost model analysis we don't skip irrelevant stmts
that are "live"; the type of the computation recorded for irrelevant stmts
(the STMT_VINFO_TYPE) is undefined (undef_vec_info_type), which is
something the cost model analysis doesn't exepct, and therefore we ICE.
This patch fixes that by making sure we skip irrelevant stmts also if they
are live.

Bootstrapped with vectorization enabled on powerpc64-linux.
Bootstrapped on i686-linux and passed full regression testing.

To be committed to mainline.

dorit

        PR tree-optimization/34445
        * tree-vect-trasnform.c (vect_estimate_min_profitable_iters): Skip
        stmts (including live stmts) that are not relevant.

        PR tree-optimization/34445
        * gfortran.dg/vect/cost-model-pr34445.f: New test..
        * gfortran.dg/vect/cost-model-pr34445a.f: New test.

(See attached file: diff.txt)

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