[autovect] [patch] Implement extract_even/odd for altivec

[Ira Rosen]

Bootstrapped and tested on ppc-linux.
Committed to autovect branch.

Ira


ChangeLog entry:

        * config/rs6000/rs6000.c (rs6000_builtin_extract_even,
        rs6000_builtin_extract_odd): Remove.
        * config/rs6000/altivec.md (vec_extract_evenv4si,
vec_extract_evenv4sf,
        vec_extract_evenv8hi, vec_extract_evenv16qi, vec_extract_oddv4si,
        vec_extract_oddv4sf): New.

Patch:
(See attached file: extract.patch)
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