No, not worried :) Found this:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61294
And then, the call to Info::GetSizeInBytes() (inline) can return 0 ... leading to optimizer producing a different path (and memset call) for == 0 case. And this brings up the warning that tells you you might have transposed the parameters (as people usually set memory to 0, not to 255 as we do here).
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