[PATCH V2, rs6000] Support vrotr3 for int vector types

Hi Segher, Thanks for the clarification! Compared with the previous one, this add vrl_and define_insn(s) for explicit AND (truncation) as Jakub's suggestion. Bootstrapped and regtested on powerpc64le-unknown-linux-gnu, is it ok for trunk? Thanks, Kewen gcc/ChangeLog 2019-07-

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