re PR tree-optimization/46312 (gcc.dg/vec-scal-opt2.c fails for ARM targets.)

        PR tree-optimization/46312
        * gcc.dg/vect/vect-scal-opt2.c: Rename to...
        * gcc.dg/vect/vec-scal-opt2.c: ... this. Expect to pass only
        on targets that support vector shifts with scalar shift
        argument.
        Remove dg-options.
        * gcc.dg/vect/vect-scal-opt.c: Rename to...
        * gcc.dg/vect/vec-scal-opt.c: ... this, and change likewise.
        * gcc.dg/vect/vect-scal-opt1.c: Rename to...
        * gcc.dg/vect/vec-scal-opt1.c: ... this, and change likewise.
        * gcc.dg/vect/vect.exp: Run vec-scal-* tests with relevant
        flags.
        * gcc.dg/vect/vect-114.c: Expect to pass only on targets that
        support misaligned data accesses.
        * gcc.dg/vect/pr43432.c, gcc.dg/vect/vect-15.c: Likewise.
        * gcc.dg/vect/pr43430-2.c: Remove dg-options.
        * lib/target-supports.exp
        (check_effective_target_vect_shift_scalar): New.

From-SVN: r166860