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[alpha] Update to new extv/insv patterns


I wrote and tested this before Richard S posted an optabs.c patch
that more or less fixes the problem generically.  But since this
is the way we want to go in the long term, and I've already done
the testing, I figured I might as well commit it now.


r~


            * config/alpha/alpha.md (extvmisaligndi): Rename from extv; update
            mode of operand 1; remove ancient extract_bit_field workaround.
            (insvmisaligndi): Rename from insv and update similarly.
            (extzvmisaligndi): Rename from extzv and update similarly; split out
            (extzvdi): New expander.
    

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