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* pa.c (mem_shadd_or_shadd_rtx_p): New function factored out of hppa_legitimize_address to handle both forms of a multiply by 2, 4 or 8. (hppa_legitimize_address): Use mem_shadd_or_shadd_rtx_p. Always generate the ASHIFT variant as the result is not directly used in a MEM. Update comments and refactor slightly to improve readability. From-SVN: r223579
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