re PR tree-optimization/49352 (-fcompare-debug failure with -O2 -ftree-vectorize)

re PR tree-optimization/49352 (-fcompare-debug failure with -O2 -ftree-vectorize)

        PR tree-optimization/49352
        * tree-vect-loop.c (vect_is_slp_reduction): Don't count debug
        uses at all, make sure loop_use_stmt after the loop is a def
        stmt of a used SSA_NAME that is the only one defined inside
        of the loop.  Don't check for COND_EXPR and GIMPLE_BINARY_RHS.
        (vect_is_simple_reduction_1): Call vect_is_slp_reduction only
        if check_reduction is true.

Co-Authored-By: Ira Rosen <ira.rosen@linaro.org>
From-SVN: r174982