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I don't see a reason to add this new function. I would just inline it into noce_can_store_speculate_p, replacing the call to memory_modified_in_p. And I'm not sure I see a reason to change the comment for memory_modified_in_p, it seems to already be accurate.
Clearly we could consider the possibility of a PARALLEL of SET insns, but of course most the compiler won't handle that anyhow. I suppose that would be a reason to use memory_surely_modified_in_insn_p, but in that case you might as well handle the PARALLEL case now.
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